They're really nice plates, and I love odd ball stuff like that, but the most I'd go is maybe $5/6 a pound. That being said, I bet one of the big collectors snaps them up, they're in great shape, and you've got the direct from the family connection.
Goudy, they're built like quality regular weights, and I've seen guys that lifted there, and they never mentioned them being odd or off for the smaller sizes. They have mentioned no really used the giant sizes though.