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Seiko Case Material Codes

Seiko has used many different materials for watch cases over the years. These greatly expanded in the late 1970's and 80's when a range of different case materials were tested and various materials were employed to utilize their specific properties. The different materials used in the watch case construction are detailed in product catalogs and are often indicated on the case itself.

The original 1991 listing from the JDM catalog can be downloaded from here - 1991 Seiko Case Codes JDM Catalog Vol1.pdf

See below for a table listing the various case material codes that have been used used.

Abbreviation	Description	Case Back Stamping
10KXS	Case of 10K yellow gold with reinforced inner body with SS	10K BASE ST.STEEL ST.STEEL BACK
10KYS	10K yellow gold case, SS case back	10K ST.STEEL BACK
14K.GP	14K yellow gold case, GP case back	14KT BASE METAL BACK
14KCE	Combined case with 14K yellow gold and ceramic	14KT + CERAMICS ST.STEEL BACK
14KXS	Case of 14K yellow gold with reinforced inner body with SS	14K BASE ST.STEEL ST.STEEL BACK
14KYS	14K yellow gold case, SS case back	14K ST.STEEL BACK
18K	18K yellow gold case	18K (18KT)
18KWG	18K white gold case	18KT
18KYG	18K yellow gold case	18K (18KT)
AAPC	All Aluminum Palladium Alloy	AAPC
ABCRP	Black chrome plated case. Back lid black chrome plating	BASE METAL
ACRP	Chrome plated case. Back cover chrome plating	CRP
AGF	All Gold Filled	AGF
AGPRUP	Ruthenium-plated on gold-plated case of the cast-in-tone. Back cover GPRUP	BASE METAL
AHC	All Hard Coat, case coated with hard titanium nitride. Back cover HC	BASE METAL
AHGC	Case coated with hard titanium nitride. (Surface hardness or resistance to small scratches, Hv = 1200) Back side HCC	HGC
ALM	Rigid light alloy	ALM
ALSGP	All Light SEIKO Gold Colour Plated case	ALSGP
APDP	Case and case back with applied palladium plating.	PDP
ASG	All SEIKO Gold Plated case	SGP
ASGP	Gold plating. Gold back plated	SGP
ASILVER	All Silver. SILVER 850 is difficult to tarnish (sulfide) uniquely developed by SEIKO, it is a hard finish or fine silver	xxx SILVER or SILVER xxx
ASSGP	Part of stainless steel plated with gold. Partially gold-plated back cover	ST.STEEL+ BASE METAL
ATI	All Titanium case. (Excellent corrosion resistance and light weight) Backside Titanium.	TITANIUM
ATIHC	Titanium case coated with hard titanium nitride. (Same for rear cover) (In addition to the features on the titanium side, it is strong in surface hardness or high scratch resistance. Hv = about 1200)	TITANIUM
ATIHICDC	All TI case with super hard coating	TITANIUM
AWGF	All White Gold Filled	AWGF
AWGP	All White Gold Plating	AWGP
BCRP	Black chrome plated side. Back SS	BCRP ST.STEEL BACK
BCRP-PCD	Case combining black chrome plating and plastic resin.	BASE METAL+ PLASTICS ST.STEEL BACK
BTIHC.MBTIHC	All high intensity titanium	TITANIUM
CE	Ceramic Case (hard highly scratch resistant, Hv = 1500, no rusting, with a beautiful surface) **	CERAMICS ST.STEEL BACK
CEAC	Case where the ceramic was coated with hard titanium nitride.	CERAMICS ST.STEEL BACK
CEHGC	Part ceramic on which the coating of hard titanium nitride was applied.	CERAMICS ST.STEEL BACK
CRP	Chrome plated case.	CRP ST.STEEL BACK
FRC	Blowing fluorocarbon resin to the lower side of the coating.	BASE METAL ST.STEEL BACK
FRC.PCD	Fused case combined resin coating and plastic resin.	BASE METAL+ PLASTICS ST.STEEL BACK
FRP	Fibre Reinforced Plastic	PLASTIC
GC	Gold Cap	GC
GF	Case affixed with gold.	GOLD FILLED ST.STEEL BACK
GHA	Case coated with hard titanium nitride. (Surface hardness is high resists against small scratches. Hv = 1200).	GHA ST.STEEL BACK
GPBCR	Gold plated and black chrome plated case.	BASE METAL ST.STEEL BACK
GPCRP	Gold plated and chrome plated case.	BASE METAL ST.STEEL BACK
GPCRP.GP	Gold plated and chrome plated case. Back side GP	BASE METAL
GPDP	Case combining gold and palladium plating.	SGP + PDP ST.STEEL BACK
GPDP.GP	Case combining gold and palladium plating. Back cover GP	SGP + PDP SGP BACK
GPHC	Case combining hard coating of titanium nitride.	BASE METAL ST.STEEL BACK
GPHGC	Case combining hard coating of titanium nitride and gold plating.	BASE METAL ST.STEEL BACK
GPRUP	Case on which the ruthenium plating was applied on the gold plating.	BASE METAL ST.STEEL BACK
GPWD	Gold-plated case, combined with reinforced wood.	BASE METAL + WOOD ST.STEEL BACK
HC	Case coated with hard titanium nitride. (Surface hardness or resistance to small scratches, Hv = approximately 1200)	BASE HC ST.STEEL BACK
HC.SSHC	HC bezel and middle with combined SS and HC back	BASE HC ST.STEEL BACK HC
HCBCRP	Coating of hard titanium nitride and the side subjected to black chrome plating.	BASE METAL ST.STEEL BACK
HGC	Case coated with hard titanium nitride.	HGC ST.STEEL BACK
HGCPC	Case combined with plastics by applying a coating of hard titanium nitride.	HGC + PLASTICS ST.STEEL BACK
HGP	Hard gold plated case. (Surface hardness is high and resistant to small scratches. Hv = about 500)	HGP ST.STEEL BACK
HSS	Case made of hard stainless steel. (Hv = about 450)	STAINLESS STEEL
HTIAGP.HTIA	Part of the hard titanium alloy on the case plated with gold	TITANIUM ALLOY
LSGP	Light colour SGP	SGP
MCOA	Cobalt hard alloy case. (Excellent in corrosion resistance and strong against small scratches. Hv = 500) Edge / Back SS	COBALT ALLOY ST.STEEL BEZEL.BACK
MHC	SS case coated with hard titanium nitride.	BASE METAL ST.STEEL BEZEL, BACK
MSS.HC	SS middle with hard titanium nitride bezel and back	ST.STEEL + BASE METAL ST.STEEL BEZEL
MSSGP	Case of SS plated with gold	ST.STEEL + BASE METAL ST.STEEL BEZEL,BACK
MSSPCD	SS bezel combined SS and plastic middle with SS back	PLASTICS ST.STEEL BEZEL
MTIGLC	Titanium coated with glass (surface hardness is higher than ordinary titanium, Hv = about 350-400) and SS.	TITANIUM ST.STEEL BEZEL,BACK
NSA	Super hard alloy side. (Surface hardness is high and resistant to small scratches, Hv = about 1200). **	NSA STEEL BACK
NSACG	A part of the superhard alloy was coated with hard titanium nitride. **	NSA+NSCG ST.STEEL BACK
NSAG	Super hard alloy case. (Surface hardness is high and resistant to small scratches, Hv = about 1200). **	NSAG ST.STEEL BACK
NSAGCE	On the part of the case where the super hard alloy and ceramic are combined the coating of hard titanium nitride was applied. **	TUNGSTEN CARBIDE + CERAMICS ST.STEEL BACK
NSB	The case sprayed with hard material such as ceramic. (Surface hardness is high and resistant to small scratches, Hv = about 700-1000).	NSB ST.STEEL BACK
NSCG	Case of super hard alloy coated with hard titanium nitride. (Surface hardness is high and resistant to small scratches, Hv = about 1200). **	NSCG ST.STEEL BACK
NSCGCE	The case combining hard carbide and hard ceramic with hard titanium nitride. (Surface hardness is high and resistant to small scratches. Hv = about 1200)	TUNGSTEN CARBIDE + CERAMICS ST.STEEL BACK
NSP	Hard Alloy Processing	NSP
PC	Case made of plastic.	PLASTICS
PC.SS	Case made of plastic. Case back SS	PLASTICS ST.STEEL BACK
PDP	Case subjected to bare Palladium plating.	PDP ST.STEEL BACK
PDPRUP	Ruthenium plated case on palladium plating.	BASE METAL ST.STEEL BACK
PM	Platinum	PM
PMP	Platinum Plating	PMP
SGP	Seiko Gold Colour Plate.	BASE METAL ST.STEEL BACK
SGP30	Case with 30 micron gold plating.	SGP30 ST.STEEL BACK
SHA	Hard alloy case. (Hv = about 700).	SHA ST.STEEL BACK NICKEL ALLOY ST.STEEL BACK
SHAGHA	A part of the hard alloy case is coated with hard titanium nitride.	NICKEL ALLOY ST.STEEL BACK
SHAHC	A part of the hard alloy case is coated with hard titanium nitride.	NICKEL ALLOY ST.STEEL BACK
SILP	Silver Plating	SILP
SILVER	Case made of silver. xxx represents value of silver / 1000	xxx SILVER ST.STEEL BACK or SILVER xxx ST.STEEL BACK
SS	Case made of stainless steel. It is harder to rust than regular steel	STAINLEES STEEL
SS.PCD	Part of SS with plastic decorations.	ST.STEEL+ PLASTICS ST.STEEL BACK
SS18K	Case of 18K yellow gold and stainless steel combined.	ST.STEEL + 18KT ST.STEEL BACK
SSBCR.BCRP	Case of the ss plus black chrome plating. Back cover black chrome plating.	ST.STEEL+ BASE METAL BASE METAL BACK
SSGP	Case of SS with gold plate	ST.STEEL+ SGP ST.STEEL BACK
SSGP.G	Case plated gold on part of SS. Ruptured Gold Plating.	ST.STEEL+ BASE METAL BASE METAL BACK
SSHC	Part of ss coated with hard titanium nitride.	ST.STEEL+ BASE METAL ST.STEEL BACK
SSPCD.BCRP	Apply black chrome plating to part of SS, case plated with plastic decoration.	ST.STEEL+ PLASTICS+ BASE METAL ST.STEEL BACK
SSPCD.FRC	Fluorocarbon resin was sprayed on a part of SS and the case on which plastic decoration was attached.	ST. STEEL + BASE METAL MIDDLE BASE METAL BEZEL ST.STEEL BACK
SSWD	SS case combined with reinforced wood.	ST.STEEL WOOD ST.STEEL BACK
STP	Stainless Steel Plating	STP
T14K.M14KWG	Case combining 14K yellow gold and white gold	14KT ST.STEEL BACK
T14KHC.M14K	Case of 14K gold yellow gold coated with hard titanium nitride	14KT ST.STEEL BACK
T18K	Case which combines 18K yellow gold and SS	ST.STEEL 18KT BEZEL
T18K.MSS18K	Case with 18K yeloow gold and SS	ST.STEEL+ 18KT MIDDLE 18KT BEZEL ST.STEEL BACK
T18K.MSSGP	Combined 18K yellow gold and SS with some gold plating	ST.STEEL + BASE METAL MIDDLE 18KT BEZEL ST.STEEL BACK
TALH.MBCRP	Hard aluminum case combined with black chrome plating.	BASE METAL MIDDLE ALUMINIUM BEZEL ST.STEEL BACK
TALH.MFRC	A coating of fluororesin was applied to the case combined with hard aluminum.	BASE METAL MIDDLE ALUMINIUM BEZEL ST.STEEL BACK
TALH.NSB	Case where the hard material was sprayed and hard aluminum was combined.	NSB MIDDLE ALH BEZEL ST.STEEL BACK
TALM.MPC	Case on which aluminum and plastic are combined.	PLASTICS MIDDLE ALUMINIUM BEZEL ST.STEEL BACK
TALM.MPCPDP	Palladium plating on case combined with aluminum.	PLASTICS MIDDLE ALUMINIUM BEZEL ST.STEEL BACK
TBCRP	Part of SS was subjected to black chrome plating.	ST.STEEL BASE METAL BEZEL
TBCRP.FRC.MBCRP	Black chrome plating and case with fluorinated resin coating.	BASE METAL ST.STEEL BACK
TBCRP.MFRC	Black chrome plating and case with fluorinated resin coating.	BASE METAL ST.STEEL BACK
TBCRP.MHC	The coating of hard titanium nitride and the case subjected to black chrome plating.	BASE METAL ST.STEEL BACK
TCE	Ceramic and SS combined case	ST.STEEL CERAMICS BEZEL
TCE.GP	Ceramic bezel, GP case	BASE METAL CERAMICS BEZEL
TCE.MTIHICDC	Ceramic bezel, TI with super hard coating case and back	TITANIUM + CERAMIC BEZEL
TCE.TIHC	Ceramic bezel, TI with super hard coating case and back	TITANIUM + CERAMIC BEZEL
TFRC	Part of SS was sprayed with fluorocarbon resin	ST.STEEL BASE METAL BEZEL
TFRC.MHC	Case coated with fluororesin and hard nitride nitride	BASE METAL ST.STEEL BACK
TGP.MCOA	Case with gold plated bezel and cobalt hard alloy are combined	COBALT ALLOY MIDDLE BASE METAL BEZEL ST.STEEL BACK
TGP.MGPBCRP	Black chrome plated and gold plated case	BASE METAL ST.STEEL BACK
TGP.MGPDP	Case with gold plated bezel and palladium plating	BASE METAL ST.STEEL BACK
TGP.MGPHC	SGP bezel, SGP and HC case	BASE METAL ST.STEEL BACK
TGP.MGPWD	Case combined with reinforced wood with gold plating	BASE METAL WOOD MIDDLE BASE METAL BEZEL ST.STEEL BACK
TGP.MHC	Case gold plated bezel and hard titanium nitride case	BASE METAL ST.STEEL BACK
TGP.MHSS	Hard stainless steel with gold plated bezel	ST.STEEL BASE METAL BEZEL
TGP.MSSGP	SGP bezel, combined SS and SGP middle	ST.STEEL BASE METAL BEZEL
TGP.TIHCCE	SGP bezel, combined TI, HC, and Ceramic one piece case	ST.STEEL SGP + SGP BEZEL
TGPCE.MGP	Combined SGP and Ceramic bezel, SGP case	BASE METAL CERAMICS BEZEL
TGPDP	Parts of SS plated with gold and palladium plating	ST.STEEL SGP + PDP BEZEL
TGPDP.G	Gold plated and palladium plated case	SGP MIDDLE SGP + PDP BEZEL ST.STEEL BACK
TGPDP.PD	Gold plated and palladium plated case	PDP MIDDLE SGP + PDP BEZEL ST.STEEL BACK
TGPGHA.MGHA	Gold plated case combined with hard material	NICKEL ALLOY MIDDLE BASE METAL + NICKEL ALLOY BEZEL ST.STEEL BACK
TGPHSS.MHSS	Case of hard SS with gold plating	ST.STEEL + BASE METAL BEZEL
TGPHTI.HTI	Rigid titanium case. (Ti alloy hardness was improved in addition to the characteristics of titanium having excellent lightness, ru corrosion resistance, Hv = 300) case with gold plating	TITANIUM ALLOY BASE METAL + TITANIUM ALLOY BEZEL
TGP-MTI	Case combining titanium and gold plated bezel	TITANIUM MIDDLE BASE METAL ST.STEEL BACK
TGPSHA.MSHA	Gold plated hard nickel alloy	NICKEL ALLOY MIDDLE BASE METAL + NICKEL ALLOY BEZEL ST.STEEL BACK
TGPTI.TI	Combined TI and SGP bezel, TI middle and TI back	TITANIUM + SGP BEZEL
THC	Case of SS coated with hard titanium nitride film	ST.STEEL BASE METAL BACK
THC.BTI	HC bezel, BTI (Bright Titanium) middle and BTI back	TITANIUM
THC.MBCRP	Coating of hard titanium nitride and case subjected to black chrome plating	BASE METAL ST.STEEL BACK
THC.MHCPCDP	HC bezel, combined HC and plastic middle with SS back	ST.STEEL + PLASTICS
THC.MSHAC	Hard cobalt alloy case subjected to coating of hard titanium nitride, case parts with hard titanium nitride coating	COBALT ALLOY MIDDLE BASE METAL BEZEL ST.STEEL BACK
THC.MSSCE	HC bezel, combined SS and Ceramic middle, and SS back	CERAMICS + TITANIUM
THC.MTIGLC	Titanium coated with glass (surface hardness is higher than ordinary titanium, Hv = about 350-400) and SS with nitride coating.	TITANIUM MIDDLE BASE METAL BEZEL ST.STEEL BACK
THC.TIHCCE	Ceramic Outer Case, TI HC Inner Case	CERAMICS + TITANIUM
THCHSS.MHSS	Ferrite hard stainless steel coated with rigid titanium nitride	ST.STEEL ST.STEEL + BASE METAL BEZEL
THGC	SS case coated with hard titanium nitride	ST.STEEL BASE METAL BEZEL
THGC.MCOAHGC	Cobalt hard alloy case coated with hard nitride	COBALT ALLOY MIDDLE BASE METAL BEZEL ST.STEEL BACK
THGC.MHTI	Case combining SS with hard titanium nitride coating on rigid titanium (Rigid Ti = hardness more than ordinary Ti, Hv = about 300)	ST.STEEL + TITAN
THGMCETIHG	Combination of titanium and ceramics which was coated with hard titanium nitride	CERAMICS MIDDLE BASE METAL BEZEL TITANIUM BACK
THGMCETIHG	HGC bezel, combined Ceramics, TI and HGC middle and combined Ceramics, TI and HGC back	CERAMICS + TITANIUM
THGP	Case of SS on which hard gold plating was applied	ST.STEEL HGP BEZEL
THTIGP.HTI	Case of hard titanium coated with hard titanium nitride	TITANIUM ALLOY
TI	Titanium	TITANIUM
TIHC.TI	Case of titanium coated with hard titanium nitride	TITANIUM
TIHNT.TI	Titanium case which has been hardened by nitriding treatment. (Hv = about 600, Matte finish)	TITANIUM
TPCBCRP.MBCRP	Black chrome plated case combined with plastic.	BASE METAL MIDDLE PLASTICS + BASE METAL BEZEL ST.STEEL BACK
TPCFRC.MFRC	Fluorocarbon resin coating was applied and the case combined with plastic	BASE METAL MIDDLE PLASTICS + BASE METAL BEZEL ST.STEEL BACK
TPCS	Plastic and SS combined case	ST.STEEL PLASTIC BEZEL
TPDP	PDP bezel, SS case	PDP BEZEL + ST.STEEL
TPDP.G	Gold plated and palladium plated case	BASE METAL ST.STEEL BACK
TPDP.GPD	Gold plated and palladium plated case	BASE METAL ST.STEEL BACK
TPDP.MPDPHC	Palladium plating and case coated with rigid titanium	BASE METAL ST.STEEL BACK
TSGP	Case of SS plated with gold	ST.STEEL SGP BEZEL
TSGP.GPD	Palladium plating and gold plated case	BASE METAL MIDDLE SGP30 BEZEL ST.STEEL BACK
TSGP.PD	Gold plated and palladium plated case	PDP MIDDLE SGP BEZEL ST.STEEL BACK
TSGP.SSG	Case of SS with gold plating	ST.STEEL+ SGP MIDDLE SGP BEZEL ST.STEEL BACK
TSHA	Case combining hard alloy and SS	ST.STEEL NICKEL ALLOY BEZEL
TSS.PCA	Case combining SS and plastic	PLASTICS ST.STEEL BACK
TSSCE	Combined SS and Ceramic bezel , SS middle and SS back	ST.STEEL ST.STEEL + CERAMIC BEZEL
TSSGP	Case of SS with gold plated bezel	ST.STEEL ST.STEEL + SGP BEZEL
TSSGP.MGP	Case of SS with gold plated bezel	BASE METAL MIDDLE ST.STEEL + BASE METAL BEZEL ST.STEEL BACK
TSSGP.MPDP	Combination of gold plated bezel and palladium plated case	BASE METAL MIDDLE ST.STEEL + BASE METAL BEZEL ST.STEEL BACK
TSSHC	SS bezel coated with hard titanium nitride, SS case	ST.STEEL ST.STEEL + BASE METAL BEZEL
TSSHC.HICDC	SSHC bezel, SS with super hard coating, and SS with super hard coating back	ST.STEEL ST.STEEL + ST.STEEL BEZEL
TTIGLCGP.MTIGLC	Titanium coated with glass (It has a higher surface hardness than ordinary titanium Hv = about 350-400) gold plate applied	TITANIUM MIDDLE TITANIUM + BASE METAL BEZEL ST.STEEL BACK
TTIHC.MTIHICDC.TI	Ti & HC bezel, Ti & HC middle, Ti Back	TITANIUM
TTIHC.TI	Combined TI and HC bezel, TI middle and TI back	TITANIUM
TTUCAC	Hard alloy coated with hard titanium nitride combined with SS case	ST.STEEL TUNGSTEN CARBIDE BEZEL
TTUCAC.MGP	Case combining a super hard alloy plated with hard titanium nitride and gold plating	BASE METAL MIDDLE TUNGSTEN CARBIDE BEZEL ST.STEEL BACK
TUCAC	Case of the super hard alloy coated with hard titanium nitride (High surface hardness and resistant to small scratches, Hv = about 1200) **	TUNGSTEN CARBIDE ST.STEEL BACK
TUCAC.SSGP	Case combining SS with a gold plate and a hard tungsten alloy coated with a hard titanium nitride	TUNGSTEN CARBIDE + ST.STEEL + BASE METAL ST.STEEL BACK
TUCSS	Case combining SS with super hard alloy coated with hard titanium nitride	TUNGSTEN CARBIDE + ST.STEEL ST.STEEL BACK
TWGP	White gold plated bezel with stainless steel case	TWGP
WGF	White Gold Filled	WGF
WGP	White Gold Plating	WGP
WGPG	Gold plated case with gold-plated bezel	WGPG