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The 51-30 Tide watch by Nixon. Movement: Custom 3 hand Swiss quartz with easy to read tide sub dial. Fast adjust button for easy setting of tide. Case: Custom 300 meter stainless steel with hardened mineral crystal, external rotating bezel with countdown timer, and screw crown at 9 O'clock position. 51.25mm diameter. Band: Custom solid stainless steel with double locking clasp. 25mm wide. Imported.