This Citizen Promaster Marine Automatic NB6021-68L features a Cal. 9051 movement with anti-magnetic materials, rendering it 16,000 A/?? magnetically resistant even at a distance of 1 cm. This ISO compliant watch is also water-resistant up to 200 meters and its 42-hour reserve runs with an accuracy of -10 to 20 seconds per day. A luminescent hour hand, minute hand, and indexes ensure visibility even in the depths of the ocean.