If you do light them, you'll find they're much better looking than today's equivalent! I have thing for bug lights in general, especially vintage ones.
I'm not exactly sure when GE went from the A21 shape to the A19 for 100 watters but I'm gonna say 50s vintage!
Yeah I lit a 60W version of this I grabbed from their basement and the light is so yellow! I think 100W lamps were made in A19 and A21 as late as the 90s! These are probably from the late-60s or early 70s since they bought the house in 1967 and probably bought these when they moved in.
I'm not exactly sure when GE went from the A21 shape to the A19 for 100 watters but I'm gonna say 50s vintage!