The hyperbaric researcher owned Single Red prototype 1'820'177, the first to carry a gas escape valve.
Most common strap size on this line: 22 mm Source: Monochrome Watches, Phillips
Ralph W. Brauer's watches
Exploration1 documented fact
Ralph W. Brauer is documented wearing the Rolex Sea-Dweller. Each watch below links to its strap size and story.
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