Anyone know for sure if this compass is from a Lancaster. Not the best of photographs I know, but in a garden shed this evening it was a bit awkward. I may get some more later this week. Also the original box I'm told...?
Generally-speaking, Lancasters were fitted with the later P10 Pilot's Compass.
The older P4 series was in use in RAF bombers from the mid-1930s and into the early-mid-WWII period. From that point P4s began to be modified with a double set of crosshairs to become a P4A such as yours, which is in effect what became the P10. Some P4As have even been noted as being overstamped as P10s.
A word of caution here.
There's a lot of radium in these units, that's what all the brown paint is on the lubber lines and the compass ring. Relatively safe enough behind that sheet of glass, but not something you want breaking.
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