The Breitling Navitimer Montbrillant Datora (Ref. A21330) with the brown dial is a highly complex, vintage-inspired aviator's chronograph produced between 2002 and 2013. It is known for its "Triple Calendar" complication and the iconic Breitling slide-rule bezel.

• Case Size: 43mm diameter and approximately 14.1mm thickness.

• Movement: Breitling Caliber 21 (based on the ETA Valjoux 7751), a self-winding mechanical movement with a ~42-hour power reserve.

• Functions:

  • Chronograph: 1/4th second, 30-minute, and 12-hour totalizers.

  • Full Calendar: Day and month windows at 12 o'clock; central pointer hand for the date.

  • 24-Hour Display: Sub-dial at 9 o'clock indicates military time.

  • Slide Rule: Bidirectional rotating bezel used for flight calculations like fuel consumption and speed.

• Case Details: Polished stainless steel with a screw-down caseback often engraved with world time zones.

• Water Resistance: 30 meters (3 ATM), suitable for light splashes but not swimming.