they remind me of an "sr" crank, think they were or are part of suntour back in the day, remember seeing them in a shop i used to work in. it's the square taper that makes me think that coz if you compare it to the ac crank the square taper is at 45 degree out similar to "sr" cranks now. also the rings look like "sr".
a rep used to bring in a similiar crank when i worked retail in 1998/1999,
i would say these are the same... but a bit later, quite nasty looking mainly because of the rings and the cnc finish.
nothing really wrong with them, just not very refined / retro quality.
my advice, get some middleburns or cooks from ebay.