My condolences to the OP.
Your father’s Sub unfortunately has had a later dial and bezel insert swapped in at some point. If you’re able to safely get the bracelet off, there’s hopefully serial number and reference info still visible on the case between the lower lugs.
Best of luck with refurbishing an invaluable memento!
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1680 MK II 2.2M (my daily); 1655 MK IV 8.1M (my 1st vintage); 16660 x 4 - 8.0M spider & matte 7.4M, 8.0M, 8.0M; 16610LV F MK I/MK I; 116528 Z; 14060 M COSC; Tudor 75090
Gone.....never forgotten: 14000 F, 14060 V COSC, PAM 048, 16623 F, 1680 MK V 3.1M, 16800 matte 8.3M & 1655 MK IV 7.4M
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