I believe they also have insanely high or low impedance... can't remember. Might be interesting to try out if you get them really cheap, but I wouldn't expect much.
Theres no shortage of those old crystal set headphones. They are almost universally mono, almost universally between 2000 and 6000 ohms impedance and almost universally don't work properly anymore. Also they are heavy for their size, being made of metal and bacalyte and sound to put it politely, unimpressive.
Can't find any better pictures of them. I think the auction is over. It said that they were probably used with a crystal radio. With means really, really old in my book.
I've been doing some research and I see them going for about $30 over here. So I guess they're not considered that interesting for collectors either...
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