Warbird Information Exchange

I have been asked to help reproduce numerous placards for a wartime L-5 restoration. Does anyone know what font (if there was a specific one) was used during the WWII years for placards on U.S. aircraft, and specifically, the L-5? I know it will not be a font that would be readily available in electronic form today, but if I can find out what it was, I can modify something else that is close to recreate what I need.

Many thanks in advance for any help or recommendations you guys can provide.

Mike