The Rolex Submariner ref. 5512, introduced in 1959, was the first Submariner to feature crown guards (the protective shoulders flanking the winding crown), distinguishing it visually from its predecessor the 5508/5510. Early examples were not COSC-certified…
The Submariner 5512. Crown guards. COSC certification - a small line of text at the six o'clock position that separates men who know what COSC means from men who do not. There is a hierarchy in vintage Submariners; the 5512 sits second only to the 5513, and only for reasons that are, honestly, about scarcity rather than merit.
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