• Model: Omega Aviator "German Air-force"
• Conditions: Very good (please see pictures for details) 
• Functions: ALL running well. Recently cleaned and oiled. 
• Movement: Mechanical (Manual wind) Swiss-Made 
• Caliber: 35.5 S-T1  / S = Seconds; T = Upgraded (transformation)
  
• Jewels: 15
• Signed Omega: Dial, Case, Crown, and Movement 
• Material: Stainless Steel Case, Crown, and Bezel (Never polished)
• Caseback Reference #: 8228781
• Serial: 7,426,785
• Year: 1931
• Dial: Black (Original Patina, Never refinished)
• Hour Markers: Arabic Numerals (Original radium, Never re-lumed)
• Hands: Steel (Original radium, Never re-lumed)
• Bezel: Stepped, bi-directional rotating, with inner calibration marker
• Crown: Ball type*
  
• Diameter: 41.0 mm without crown 
• Case Thickness: 15 mm 
• Lug Width: 23 mm / Wire style
• Strap: Unworn military nylon
• Other: Screw-down caseback, Small seconds, Dart hour marker

• No Box
• No Papers

*The large ball crown of this watch is placed on an extended stem, to facilitate winding by aviators, who wore heavy gloves

Very rare and hard to find. Collectible timepiece!