i also did loads of google image search... but there was absolutrly nothing similar. I have got them from spain.
early till mid 90s is right i think. they were on a kona mixed up with m900, judy sl, hope ti glide rear hub, mavic 117 rim...
Maybe we will never find out...
yes the chainrings have a manufactur name, but i forgot about it. But i also googled it and didnt found cranks...