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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