Genuine Caseback Rolex opener removable tool Rare collectable

Previously, this type of tool number -2 - in the form of airplane propeller, full steel, used to open the Rolex Oyster casebacks.It was convenient and ergonomic dual functions because it has 2 types of openings in diameter depending on the model background, English nicknamed "caseback".it is signed "Rolex OYSTER" at the 2 endlinks and the legendary mention "SWISS MADE"On each part is specified measurement, 26.5mm and 22.5mm on the other, which corresponds to the diameter of the funds of each model.There are several references to these tools (from 1 to 9), different sizes, here is a very beautiful specimen.True museum piece!