One of my original GE 6012 sealed beams expired in January, exactly 49 years old! I replaced both with Sylvania. They are OK for light but they are cheap looking (maybe because they were very cheap) and super ugly compared to the originals.
If anyone has one or two of the original GE 6012 lamps I would be interesting in buying. Working of course, not burned out! Send me a PM if you have for sale.