RAF Pilot or Navigator's Stopwatch Mk. IIIA
The reverse of the case is unusually simply marked with a AM, a King's Crown and 818, rather than the normally seen code 6B/117 or 6B/221. The main dial is graduated from 0-60 seconds and the subsidiary 0-30 minutes. This example has been personally highlighted in red at the 7 and 10 minute marks and clearly an addition made by the original owner. It appears in good working order, although on sale as a collectable and we cannot guarantee its time keeping properties. Please also see associated item 5448B.