With Cartier 18K white gold extra bracelet link.
The present watch is number 90 of a limited edition of 150 examples made in platinum to celebrate the 150th anniversary of Cartier in 1997. It is also a re-edition of the historical Tank Guichet model launched in the late 1920s.
This model is illustrated and described in Cartier - The Tank Watch, by Franco Cologni, pp. 206 & 250.