Hi  attached is a lot of files apertaining to the seiko casing guide information. 03. Casing Guide seiko.pdf Seiko Casing Parts List (1977) IV. Cal. 3302 to 5245-6010.pdf Seiko Casing Parts List (1977) V. Cal. 5245-7000 to 5740-8010.pdf Seiko Casing Parts List (1977) VI. Cal. 6100-8000 to 6245-9001.pdf Seiko Casing Parts List (1977) VII. Cal. 6306-5000 to 8346-9020.pdf Seiko Casing Parts List (1977) I. Notes & Index.pdf Seiko Casing Parts List (1977) II. Watches Japan Market Only (1