Yves Montand wears a Cartier Tank

Jean-Marc Clement, a New York billionaire of French descent, hears that an off-Broadway revue plans to make fun of him and goes to the theatre to put a stop to it. He arrives while Amanda Dell, played by Marilyn Monroe, is rehearsing My Heart Belongs to Daddy, and by the time the number is over he has been mistaken by the director for an actor who could play the billionaire, taken the job, and given his name as Alexander Dumas. To learn the trade he hires Bing Crosby, Gene Kelly, and Milton Berle, playing themselves, as tutors. George Cukor directed Let's Make Love (1960), with Yves Montand opposite Monroe, from a screenplay whose writers included Norman Krasna, Hal Kanter, and Arthur Miller, Monroe's husband at the time. It was the last musical she made.

Clement wears a gold Cartier Tank, the rectangular dress watch Louis Cartier introduced in 1917. The identification comes from a single French watch magazine, which states it plainly and offers no frame to check; no other publication has taken up the question, and the surviving press images favor Monroe rather than Montand's wrist. A gold Tank on a character who rules, as the magazine puts it, New York and the stock exchange, is an easy claim to believe. Believing it is still all the record allows.