I got this on ebay, the seller has more. The bulbs were made in 1982 and have unsupported filaments. My favorite memory of these bulbs is the rather neat classic ge etch, it goes way back to the mazda era!
Dave, the cool GE/Mazda style etch can also be found on the relatively recent (1990s) Garage Door bulbs in 40 and 60 watts. Those are cool acid-etched bulbs with C-9 filament, brass base, 3,000 hour life and cool etch. They are basically 120v Survivors.