Vacheron Constantin

I've been searching for information on a pocket watch I was given and can't seem to find much. It is a gold pocket watch that says: Vacheron & Constantin In Geneva Hands N 79951 Detachd Lever Thirteen Jewels The key for the watch is attached to a Phi Beta... 

especially of the dial, movement and inside cases, we can probably help more A

Let me know if you need anything else. I appreciate it....  

Sorry about multiple posts, I wasn't sure how to get the back open at first....  

would be the VC itself. I can put you in contact with someone who will be able to help you more definitively. I don't see any red flags that make me think this is not a legitimate VC. Movements at this time were not engraved with their own serial numbers.... 

It is time to get VC's opinion on this, they'll probably want to remove the dial and look for the markings on the bottom. It doesn't seem quite right to me, since the marked jewel could differs from the visual assesment (it appears to have 15 jewels), but... 

This is a very beautiful and genuine 18k gold Vacheron Constantin pocket watch. According to Production dates of Vacheron Constantin, your watch have been produced between 1850 -1851. The last step you have to do in order to find out that it is 100% genui...