Rolex Submariner non serif dial ref 5512The Rolex Submariner 5512, introduced in 1959, was a pivotal reference that helped define the modern Submariner, most notably through the introduction of crown guardsa first for the model line. Produced alongside its nonchronometer rated sibling, the 5513, for roughly two decades, the 5512 set itself apart with its chronometer certified movement. Over its long production run, the reference saw several noteworthy evolutions, including changes to the