I believe we have two Cartier Boutiques here in Miami, FL. I keep forgetting to call Cartier before they close and their website is no help. Thank You All In Advance For Your Kind Assistance, KFC, III. I'll be most appreciative for any assistance anyone can provide, including informing me if it's not possible to identify the specifics of the watch this way. I've searched the Internet for some hours now for information regarding identifying the specifics about the watch using the serial and other numbers on the back, but have come up empty. I don't know where the certificate is, or if I'll ever find it. However, I know it's a Cartier Tank, and that's about it. Cartier Serial Number Jewelry AuthenticationĪ dearly departed friend left me his Cartier Tank.