Vaguely. I temember these as coming on relatively low end bikes from Germany, or elsewhere in northern Europe, in the late sixties and seventies. I sort of recall that it was something with an "H", like Heinemann or similar.
I hope that helps.
As I said, it's been a long while, but if you don't have the crank, I suspect that you won't find one easily.
Last edited by FBinNY; 12-22-22 at 12:28 PM.