One of the highest echelons of Rolex collecting is represented by military timepieces. That is: watches made for the armed forces of a country. The company is known to have at some point in time worked with numerous armed forces or military organizations, including the English Navy, Italian Police, and of course the Peruvian Air Force - as in the case of the present timepiece. Watches made for the Fuerza Aerea Del Perú - or FAP - are today extremely elusive pieces not only in virtue of their intrinsic rarity, but also because of the heavy usage they underwent which implies many pieces were simply lost, and many others were heavily refurbished.

While the most obvious characteristic of FAP timepieces is the engraving to the caseback, there are other two traits that define these watches. One is that the serial number - all or part of it - has to be present to the inside of the caseback, thus linking together case body and caseback. The other is a much more subtle detail, and often lost due to the reasons mentioned above: on the opposite side of the back from where the FAP engraving is, these watches present an extremely lightly engraved military issue number. So light is this engraving that even a few polishings would irremediably erase it. Only a meager percentage of FAP watches still retain this number today, and this piece is indeed one of them, the number 611 is present and crisp to the outside of the back.