hi everyone I bought this think if I was getting a Vintage Vacheron Constantin watch. It came on a long strap Vacheron Constantin strap that I am keeping . It 18 k yellow , tang looks gold ( not marked) and so does the spring bar ( not marked ). 16 mm inside diameter... will accomodate modern straps 450$ usd plus shipping and fees .... If you have any questions please email or pm I am in nyc so a f2f is no problem . Good hunting Bill [email protected]