Bulova 1979 Longchamp information

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Dear guys,
I have this Bulova Longchamp purchased in 1978. I would like to have some information about the movement 10CK of this Longchamp. Moreover I also would like to know how did look both the original buckle (it have been lost) and the crown (it is unsigned and so I think it is not original)

Manufacture Year: 1979
Movement Model: 10CK
Movement Jewels: 17
Case Serial No: 5 242975

Many thanks!
Francesco