BEagle ...
My Chipmunk QFI had one of these in greyish rubber from Ever Ready which he added a neck lanyard to and tucked it under his shoulder straps ... just right for reading the external wing root fuel gages on the Chipmunk at night. He called his "Betsy" ...
I think the red version above was standard Police issue in the 60/70's ... long before those aluminium truncheons from MagLite appeared from the US.
Coff.