RAF Mk.4 cockpit clock

Manufacturer's Model 43A-4.  Stores reference 6A/2197.  American designed clock with an 8-day keyless seven jewel lever movement.  Metal case approximately 6 x 5cm with 5cm black dial having luminous Arabic numerals, hands and sweep second hand.  Single winding and setting knob at the 6 o'clock position.  The dial is in excellent condition and marked '8 DAYS'.  The case is also very good bar a few paint chips.  Stamped to the rear with 'Mk.4', Air Ministry marks, stores reference number and 1941 date code.  Easy to wind but hand setting is tricky as the relevant cogs don't seem to mesh properly.  It can be done but takes a little effort.  The movement ticks away strongly and keeps good time.  Stock code C26591.