This is a AYC-1 Bordwatch with a small 30-minute counter and small minute hand at position „6“; The second hand of the stop function is located in the center of the large dial. When pressing on the right crown, the central second hand and the small minute hand of the lower counter stop. This model AYC-1M does not have a running second hand, which, like the model AYC-1 in the center, always runs together with the main work,this russian aircraft in-flight chronograph – made in Chelyabinsk – is still used today in many aircraft and helicopters of the Russian Air Force,Clock ran on my desk for about 3 weeks, it works perfectly and is very accurate and reliable,very nice display object for the desk in the include wooden box,Clock is little used, was mostly a display object,Case: aluminium,Dial: black,Diameter: 80 mm,Height: 69 mm,72 hours power reserve,The second hand and the minute hand in the lower sub-dial are associated with the chronograph. The upper auxiliary dial serves as a flight hour counter and can also be used as an indicator for a second time zone,include original styrene box and a german manual,bordwatch is unused in mint to new condition !!