1918 Rolex Semi-Hermetic Pre-Oyster Vintage Mens 9K Gold Watch - Very Rare Sapphire 539 "Armadillo" Calatrava

539 "Armadillo" Calatrava

Presents as like new on the wrist

For the finishing touch it comes equipped with a period correct Rolex leather strap making it ready for immediate enjoyment

The silver dial is original and untouched and absolutely mint

1918 Rolex Semi-Hermetic Pre-Oyster Vintage Mens 9K Gold Watch - Very Rare Sapphire 539 "Armadillo" CalatravaWithout question one of the company's greatest contributions to horology is in the area of waterproof cases. The Rolex Oyster case birthed the idea of the modern sport watch as we know it and was a key catalyst for the initial widespread acceptance of the wristwatch. But before there could be a full hermetically sealed watch, like the Oyster, there had to be a semi hermetically sealed one, like this watch. While many collectors know that Rolex birthed