These are standard dash board lights found on many British war-time soft-skins and AFV's. My Humber MkIV had one on the dash.
As previously said, Richards pattern were a pre-war commercal design which were probably deleated from use very earlly if not pre-war.
I am supprised to see these dash lights being used for this purpose. It would be usefull to have a look in the manual.
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