2364 South US Hwy 231 | Ozark, AL 36360 - USA
T: 334-774-3584 | F: 334-774-7083

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P/N 400267 - 12-Minute Mechanical Clock
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Waltham, in cooperation with Douglas Aircraft, has developed the first ever twelve-minute mechanical clock.

We have taken our basic aircraft design and incorporated a tote hand that revolves every twelve minutes vs. sixty seconds. This allows pilots to better gauge the amount of time elapsed. The stop, start and flyback of second and minute hands do not disturb the time of day. The lever for adjusting rate is accessible without removing the clock from its case. The clock contains an anti-magnetic, temperature compensated hairspring to insure accuracy. Not affected by environmental extremes or system failures.

  • Lighting: per Douglas Aircraft Company Spec. 7936766
  • Weight: 12 ounces maximum
  • Case Finish: Black anodize per MIL-A-8625 Type II, color no. 37038 or federal standard 595


  • Jewels: 20-five more than required by military specifications to insure accurate performance
  • All Waltham mechanical aircraft clocks are domestically produced and are certified to conform to FAR#52.208-1. They contain domestic jewels produced by the government’s Wm. Langer Jewel Bearing Plant as required by FAR Subpart 8.2 completely domestic manufacture spare or replacement parts are readily available.

Operation and Installation

  • To wind clock, rotate winding knob in a clockwise direction until a stop is reached
  • To set clock, pull winding knob out and rotate as required to set time of day hands. Knob will return to winding position when released.


  • Pin A: 5 Volt AC or DC
  • Pin B: Common Ground


  • Connector: DTIH-10-6PN
  • Custom Connectors Available
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