AChS-1M ACS-1M (AChH ACH) 1960's cockpit clock, airplane mechanical clock chronograph. Fully working. Tested!

Made in USSR (Soviet, Ukraine, СССР)

Very good condition! It has small traces of use. Fully working. Please see the photos for the assessment of the clock. Clock runs well and keeps time accurately. Really look much better than on the photo

This Soviet USSR Cockpit Clock is a unique piece of military aviation history. It was designed to be used in Mig and SU planes and is a fully functional chronograph. The clock is a true collector's item and has been kept in good used condition. Its country of origin is the USSR and it has not been modified. This clock is a must-have for any aviation or military enthusiast.

Description (in Russian) you can use googletranslate:

https://www.avsim.su/wiki/%D0%90%D0%A7%D0%A1-1

AChS-1 aviation clock are intended for indication:

• current time in hours, minutes and seconds;
• measurement of flight time in hours and minutes;
• measurement of short periods of time in minutes and seconds.

The AChs-1 clock is enclosed in a case equipped with an electric heater with a temperature regulator.

Technical characteristics of AChS-1

• Stopwatch scale capacity - 60 min.
• The deviation of the clock from the exact time per day at 20 ± 5º C is not more than ± 20 s.
• The period of balance fluctuations is 0.4 s.
  

Type of the stroke - free anchor.

Type of the balance sheet - monometallic.

Type of the engine - spring double-drum parallel action.

Power reserve is 3 days.

Periodicity of the winding is 2 days.

Jewels: 25.

Temperature of inclusion of an automatic heater - + 5 ° C.

The shutdown temperature of the automatic heater is + 25 ° C.

The operating voltage of the electric heater circuit is 27 ± 2.7 V.

The ohmic resistance of the heater is 50 ± 2 Ohms.

The maximum operating modes of the clock:

• load 5 MPa, speed 5 m / s, load × speed - 12 MPa • m / s;
• load 14 MPa, speed 0.3 m / s, load × speed - 2.5 MPa • m / s.

The probability of failure-free operation for 2,000 hours at 20 ± 5º C is not less than 0.94.

Overall dimensions - 85 × 91.4 × 91.4 mm.

The weight AChs-1 - no more than 655 g.

There is a dial with 3 scales:

• large scale - for counting the time in hours, minutes and seconds;
• “flight time” scale - for counting flight time in hours and minutes;
• “seconds” scale - for counting the stopwatch operation time in minutes and seconds.

The AChS-1 clock is controlled by two heads:

• left - for winding watches and moving hands; for start, stop and return the hands of the flight time movement to the initial position.
• right - to start and stop the clock; start, stop and return to the initial position of the hands of the stopwatch.

Operating conditions:

• Ambient temperature - from + 5 ° С to + 30 ° С.
• Relative humidity - up to 85%

Clocks for the fastest and highest-flying Soviet / Russian combat aircrafts (such as MiG-23, MiG-25, MiG-29 and Su-27)!

These clocks have been designed to withstand speeds of Mach 3 / 1800 mph (2900 km/h) and altitudes of up to 100,000 feet (30 km). These robust timepieces are built to keep time flawlessly while pulling 6G's! Built-in 27-volt heater ensures operation even at -60 °C (-75 °F). Each measures approximately 3 inches (8 cm) in diameter by 3 inches (8 cm) deep and feature a two-day / three-day precision clock movement with 26 jewels, inside an all-steel, dustproof and waterproof case.