Rolex Oyster Precision Ref. 6424 36mm “Big Oyster” Circular-Finished Silver DialAs we've mentioned before, sometimes the simplest version of a watch is the best. No need for extra features, embellishments, or unnecessary detailsjust the essentials. Exactly what the designer envisioned from the start. This is a perfect example of that kind of watch! This is a rare Oyster Precision Reference 6424, nicknamed the Big Oysteras most of the Precision Line models were in the more modest 34mm size, while this one comes in a larger 36mm