Vacheron Constantin

Hello everyone, Trust you are all having a great wednesday! I am currently taking an interest into this classical piece from VC's historical collection, ( please do correct me on this, but from what i have read someplaces write it as Historical, but is th...  

the serial number will differentiate between the two styles of caseback, one being earlier than the other. It does not appear to be related to the metal used. For the benefit of those whose curiosity you’ve aroused, you have a front view?

Yes, a friend of mine told me later that it seems to be due to the production years, with the curved writing being earlier (before the mid ~ late 1990s) and the straight line ones thereafter. And yes indeed, heres the front view of the piece my friend Bes...