In 1932, Rolex patented the first automatic movement with a winding rotor that turned 360 degrees upon a centrally located pivot. Fixed on an existing movement with the rotor span on top, the domed caseback allowed for extra space, leading this watch to be nicknamed "Bubbleback". Fitted with a waterproof case, this timepiece was to become a huge success throughout its production period, from the early 1930s to the 1950s.

The Rolex reference 3627 is one of the rarest and most beautiful Bubblebacks of all time. This reference is so rare that many seasoned collectors may have never seen one in the flesh. Manufactured in 1937, the present watch displays two patents, one on the caseback with the name of the country where it was registered and another on the rotor.

The present watch furthermore impresses with its extremely attractive stainless steel and pink gold “Grain de Riz” folded bracelet. The massive bicolor hooded lugs procures a somewhat medieval touch to the watch and fantastically contrasts with the round, smooth, mirror-finished bezel. The pink dial is of the best effect and perfectly matches the pink gold plated bracelet. The dial is further signed with the name of the prestigious South American retailer Serpico y Laino. This wonderful watch exudes the most flamboyant charisma of watch designs from the 1930s.