Vintage Soviet Aircraft AChS-1 Mechanical Cockpit Clock As Used in A MIG 21 Tu

This Vintage Soviet Aircraft AChS-1 Mechanical Cockpit Clock As Used in A MIG 21, is in very good working condition. It dates to ~ the 1970s, and the design is supposedly based on a Jaeger-Le-Coultre but made by the Chelyabinsk Watch Plant (Molnija-Lightning), USSR.

An image of the internal movement of this type of clock is appended, as is an image of the MIG 21 cockpit with a yellow arrow pointing to this type of clock.

Technical Summary:

• Luminous Dial and Hands
  
• Serial No. 61570
• Winding Time: ≥ 3 days
• Accuracy: ± 20 s/day
• Number of jewels: 25
• Operating temperature range: ± 60°C
  
• Dimensions:
  • Maximum Face Diameter: 8.5 cm
  • Depth (including buttons): 9.14 cm
    
• Functions:
  • Stop-Start Clock movement (turn the button marked MYCK counterclockwise until it clicks)
  • Tachymeter
  • Stopwatch
  • Current Time
  • Flight Time
  • Reset Buttons

This type of clock was used in many other USSR era military jets, bombers and helicopters besides the MIG 21.
 
It would make a lovely or collectible for aficianados.