Aircraft Clock, AChS-1, USSR, Working PBY Catalina

Aircraft Clock, AChS-1, USSR, Working PBY CatalinaThis is a very competent example of the mechanical Soviet military aircraft chronograph, type AChS 1. The electrical connection in the back is to power a heater to the instrument, along with the mounting bracket. There is a helpful description of its multiple functions at http: www. prc68. com I 8day. html and we won't bother to repeat it here. Once wound, the clock operates as it should. Its nice to hear a ticking clock once in a while!

indicator is at upper center)

allowing for course adjustments left or right

part number 716K-01-7007

The aircraft altitude and speed was entered on the rear of the sight

Mod 27 as used in bomber aircraft of the Royal Air Force such as the Avro Lancaster (see illustration of the Lancaster instrument panel from the Pilots Notes showing the location of the indicator)

was used across virtually all its aircraft during WWII

from 0-4500

Here is a WW2-era British Airspeed Indicator IXE 6A/585 WW2

This T-1 Sighting Head was made by AC Spark Plug division of GMC

c)  if Single is selected

but the glass and face markings are intact

Possibly for a Canadian-manufactured Hawker Hurricane or Mosquito