I didn't know these existed until a few weeks ago at 35mm! This thing is huge compared to the classic ones. The watch is very good overall with a good case and dial in good condition. The band was custom made for it by Aaron Bespoke.
 
Details:
 
Brand: Cartier
Model: Must 21
Reference: 9011
Year: 1990's
Material: Stainless Steel
Dimensions:  35mm
Crystal:  Mineral Glass
Movement: Quartz Movement
Bracelet/Strap: Aaron Bespoke Leather Band and GP buckle
Box/Papers: No/No