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Vacheron Constantin

Need help with reference numbers, please.

 

Just purchased mid-nineties(?) jump hour, and would like help with the numbers. On the movement there are nos. 1120/2 which refers to the caliber I think, and the no 797989 which I cannot identify. ON the outer gold ring on the back are the nos. 662172 and 43040. I think 43040 is the model no. but I do not know what 662172 is, unless it is a case no. Also if anyone can tell me when It might have been produced that would be helpful. Thanks, Frank

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