Hello all,
I have recently acquired a large box containing many dark blue light bulbs. They are made by Westinghouse Mazda, rated at 25 Watts and quite unusual to me. I have searched quite thoroughly but couldn't find a match on the internet. They also came with an old quality control certificate (see image).
I was wondering if anybody had a clue as to what these might be used for? I saw some with a more cylindrical shape that appeared to be used for a sign of some kind but I am not sure if that is actually what these would have been used for.
Any clues would be appreciated!
Thanks for your time,
Kefo
