Details & Specifications • The reference M1-30-10 is described as a Marineflieger-Chronometer / naval aviator chronometer.  • Case: stainless steel  • Diameter: approx. 40 mm  • Height / thickness: approx. 10.1 mm  • Water resistance: 10 atm (i.e. 100 m)  • Movement: automatic, chronometer-grade  • Dial / other: black dial, luminous hands & numerals, date display, sapphire crystal  • Limited edition: 252/999 pieces