Watch: Cartier Tank Solo W5200013. This Cartier Tank Solo screams classic elegant Cartier, signature black Roman Numeral hour markers over a white dial. Complete with box, papers and manual this watch is dated to December 2020. 31mm stainless steel case x 24.4mm. Sapphire scratch resistant crystal and waterproof to 30 meters. Full length steel bracelet with double folding hidden clasp. Blue Stone in Crown. An excellent example of a classic Cartier.