Wheel lock of a firearm

Wheel lock with external wheel. A narrow band, which rings around the square, protruding axle, holds the wheel on the front and back of the wheel plate with a bolt. Flat lock plate, sliding cover. Between the bolt of the cock and the bolt of the cock spring there was probably a connecting strip. On the rear part of the lock plate there was a mechanism, now missing, which served as a safety mechanism for the trigger.