Which famous watchmaker received official military endorsement during WWII, creating the 'A-11' that became known as 'The Watch That Won The War'?

During World War II, many consumer brands pivoted to support the war effort, creating unique military-civilian brand partnerships that shaped product design and marketing for decades to come. Some companies even received special military contracts that transformed their business forever. This trivia question explores one of the most interesting and lesser-known military product endorsements from that era.

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Bulova
Rolex
Omega
Hamilton