Thanks Peter, Maybe you have shot it as well while visiting Brian ? Don't get to shoot them very often as they are illegal in New Jersey.
My post of the 58' dated cocking piece was to help support that the Shirley plant equipment couldn't have been in Pakistan making POFMk.1's in 1952 and as you say, Maltby stayed in England
so, that would help narrow down just what was sent to POF and by whom, in the early 50's.