Rolex Deep Sea without the Deep Sea. Ref 6532 1955

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Described as a Vintage Rolex Deep Sea Prototype Ref 6532. Has Oyster Perpetual but no Deep Sea on dial. It seems a few of these existed. But looking for more info.

Thanks
 
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That dial did not come from a Rolex factory.
 
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It’s supposed to be a prototype Deep Sea but I think it’s a Canadian Oyster Prep. Brevet case with a serial # from 1955.
 
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“Deep Sea” isn’t on the dial of this watch. Most ref 6532 Rolexes have Deep Sea as a thirdline under Rolex. Sometimes it fades at a different rate than the other script on the dial. It looks like some early Canadian Deep Sea Oyster Perpetuals didn’t have anything identifying it. Either way its a rare authentic dial in a Explorer sized case.