Vintage Vacheron Constantin: Dial, Case, and Movement Questions from a Newcomer

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Hi Omega Forums experts,

I'd like to collect vintage Vacheron but I feel I lack the knowledge to get started. I was hoping to learn by sharing a lovely watch I saw on Instagram and asking questions about it

Here's what I'm wondering:

1) In the last image (up-close shot of the signature) there looks to be some vertical striations. Is this a sign the dial was sanded and restored?
2) Generally, what do you look for when assessing whether a VC dial is completely original? Certain fonts? Accent shape? Anything else?
3) I see the case has an eagle stamp, which I've learned is a French hallmark. Does this mean the case was made in France? If so, does this have any effect on desirability/value?
4) Do people care whether a VC movement has/doesn't have a Geneva seal?
5) Is there anything about this watch that could be a useful lesson for a VC novice?
6) Is there a database somewhere of original VCs that I can use for comparison? In UG collecting there is Sala's book and it has been incredibly useful to me in my UG collecting journey

Thanks in advance for any guidance -- I really appreciate the time and expertise of all the forum members here

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