These watch straps - available in 18mm - were very widely used in the 1950s and 1960s prior to the introduction of today's nylon NATO straps
Enhanced Nighttime Visibility: Utilizes Super Luminova for improved nighttime visibility while retaining the historical encircled T on the dial
when MWC was commissioned by a U
which appears on their website at this link
All MWC 500M diver models come with a helium escape valve
20mm FKM (Patterned) Rubber Strap with Quick Release Feature for Fast and Easy Fitting and Removal 18mm NATO Straps These watch straps - availableFKM2 FKM, short for Fluoroelastomer, is a high performance synthetic rubber known for its exceptional density, durability, and resistance to water, chemicals, oil, and heat. Originally developed for aerospace applications, FKM was designed to meet the stringent reliability and longevity requirements of aircraft and space missions. These qualities make FKM straps highly favored by military personnel, police officers, and professional divers, as they