the buyer assures me its real but has no documentation, he said to call cartier and give them the serial number for authentication. The auction looks suss (i mena no reserve and starting at $1) and some of the other item s teh seller has for sale are fake, i.e. versace and armani bracelets which are identicale with differnt logos according to the house. But on the same hand the seller is pretty good feedback etc. and owned a store near me in which this jewlery is also sold at, he offerd me to pop in and try the watch on, (the seller runs a second hand jewlery store) so im confussed right now i mean would a serious bussiness sell fakes? they never say the other designer things are authentic just state the designer in the title this acctually states its authentic.