https://www.qsl.net/k7em/henry_amplifier/Kilovac_HC-1_Relay.pdfOn this link, scroll down to the Coil Data box and see the coil resistance. That should tell the story.
Max Gain Systems has vacuum relays. His prices are about as good as anyone. A few years ago Kilovac was selling relays discounted to hams but that program has expired. They seem to have a ham or two there.
73 de Norm W1ITT
Thanks. I should have spotted that. And the answer is E) none of the above, 50 ohms. The spec for 12V is 80 +/- 10%. Most curious. It's probably 9V for use in 6 transistor portable radios.
So I measured them. One had a pick-up voltage of only 4.2V and a drop out of 2 V. The other had a pickup voltage of 6V and a drop out of 2V. They are marked the same and have nearly identical coil resistance. They aren't new.
Maybe I really will run them at 9V.