That is the earliest model of the Rolex GMT-Grasp Ref. 1675. The Bakelite bezel that outlined the sooner 6542 is gone in favor of the steel insert that may grace the 1675 for its total run. This bezel has aged and light considerably from its look when it was made. After I consider an early 1675, I consider one thing like this: a bezel insert with a pale child blue part for the night time and a delicate, light purple for the day.
The very earliest instance of the 1675 is the so-called “OCC” dial, with textual content under GMT-Grasp studying “Formally Licensed Chronometer.” The OCC textual content is known to replicate the usage of the non-microstella 1535 caliber, although there have been some seen that really do embrace the newer 1565 motion. Quickly, with the formal introduction of the microstella-regulated 1565 caliber, we’ll see a shift to the “Superlative Chronometer Formally Licensed” textual content.
The OCC dial is similar to these discovered within the 6542 however barely bigger, so they don’t seem to be precisely interchangeable components. As with the 6542, this 1675 has a hyphenated “Oyster-Perpetual.”
Aside from the standard-issue aluminum bezel insert, one other defining characteristic of the primary metal 1675s, and certainly all subsequent ones, is the looks of crown guards on the aspect of the case. These will evolve a bit right here and there, but when a 1675 is product of metal, it’s going to have crown guards.