Along with quite a bit of WWII aircraft items etc., a personally made film by this person of the building of the Alaska Rail Road during WWII ...The original owner was a film and photograph buff, a one of a kind photo album of WWII bombers, 

Radios... electronics... etc.  ....This came from a fellow in Pueblo, Colorado who was in the Army Air Force during WWII.

His primary job was as an Aircraft Mechanic.  I have lost contact with the family many years ago so 

I will refrain from mentioning his name.  In any case due his electronics and photography background, he was involved in a great deal of classified stuff during the War (In addition to being a bomber mechanic).

As far as this bulb goes, as is is American made in the 1940s it is "technically" a reproduction of the German bulb.