51-30 Chrono Black Leather/Pumice/Charcoal Watch size-k13-01 The designers of the first

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51-30 Chrono Black Leather/Pumice/Charcoal Watch size-k13-01 The designers of the firstDescription Nothing else quite measures up. Named after the face size (51mm) and water resistant rating (300 meter 30 ATM), the 51 30 Chrono Leather is the OG oversized watch that birthed a whole style movement. It's the ultimate statement piece, but its pro level chronograph and waterman functionality makes it so much more than a pretty face.