I have some good ones! Not sure of the dates but the fixtures are from the 40s through the 70s! I never knew the GE Mazda lamps were so old. I have one in my old desk lamp. I need to remove and put it away. Got a lot of old Westinghouse F40T12 preheat lamps, Lots of "Mainlighter" GE F40s and the "Lifeline" Sylvania F40s. Got some 6 foot "Powergroove" GE T17s and the 5 foot F90T17 preheat Westinghouse lamps (mogul bi pin)....ALL run with preheat ballasts.

I LOVE preheat fluorescents!