Nixon 51-30 in Matte Black/ Surplus 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, & screw crown at 9 clock position. 51.25mm diameter. Band: Custom solid stainless steel withdouble locking clasp. 25mm wide.