When Rolex patented its first successful "Perpetual" self-winding wristwatch in 1932, it was a milestone moment in horology. This movement, combined with the Oyster screw back and patented crown, left many watchmakers of the period looking outdated – and no doubt fuelled Rolex’s lasting success. The present lot, nicknamed “Bubbleback” due to its domed caseback, whilst considered petite to today’s standards with its 33mm case, looks much larger thanks to its powerful case and partially hooded lugs. The rare black glossy dial with gilt outer railroad track, bold luminous numerals and markers and its uncommon interior 24 hour numerals further enhances its charisma.