Nixon brand wrist watch. This was an early SAMPLE watch that became the Nixon 51-30. It has a tide high-low meter, and left side crown. This is for the watch only. *NEEDS NEW BATTERY AND STRAP* Here’s a detailed description of the 51-30: The Nixon 51-30 watch comes with a custom three hand Swiss quartz movement with easy to read tide sub-dial at 4:00 on the dial. A fast adjust button for easy setting of tide is located on the left side at 8:00 just under the crown. Features a 51.25mm wide stainless steel case, a water resistance to 300 meters, a hardened mineral crystal, an external rotating bezel with countdown timer markings, and a screw crown at the 9 O'clock position. The case is fitted with a stainless steel bracelet with a deployant clasp. 25mm wide at the lugs. Includes an engraved, solid screw-in case back for increased water resistance.