quartz movements were not considered
These new lightweight metal models
Chronograph up to 60 minutes in 1/5 second increments
officially licensed by the US Navy and created with their authorization and approval
mechanical movements never require a battery
Ball NM2050C-P1A-BK Engineer Master II Aviator Oversize Rubber Strap Tutima quartz movements were not consideredMovement Automatic caliber BALL RR1102 Functions 31 micro gas tubes on hour, minute, second hands, and dial for night reading capability Hours, minutes, sweep seconds, day and date Shock resistance 5,000Gs shock resistance Water resistance 100m 330ft Antimagnetic 4,800A m Case Stainless steel (NM2050C 01) Stainless steel with TiC coating (NM2050C 02) 48mm, height 13. 5m Anti reflective convex sapphire crystal Screwed in crown Band Stainless steel