My comments above was not meant to apply to all watch companies, just Omega.
In fact, Longines (a corporate sibling to Omega) has one of the best vintage departments around and will be happy to provide all the information on your vintage Longines via email for free. They'll even send you a extract from the archives, also at no cost.
https://www.longines.com/#!/customer-service/services/certificate-of-authenticity
On the other side of the coin, Rolex would just give you a haughty sniff at the request for any information regarding one of their vintage watches.
Every company has a different culture.
gatorcpa
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