I look forward to hear more about this cap. Sorry i can't help you with this one.
my view is that it is 1950's period. This is based omn the interior mainly as I think the crown material is the waterproofed cotton found in the fire brigade caps of that era. I have seen several examples with this material and also the chin strap is shiny to the degree I believe is plastic coated rather patent leather look. Again the chin strap looks very similar to ones I have handled before. The logo on the celluloid looks a bit modern to be 1930's/40's IMO and the cap itself is I believe for a civilian organisation .
But I'm no expert........
hope this helps the discussion.