I can pick this up from a local bike junk collector guy for super cheap - except there is no non-drive arm, just the spider side, and I’m not totally sure what this is.
Looks like a Sugino Mighty, but the black parts on the spider are not cut-out?
if its 144bcd my guess is mighty or super mighty. seems mostly worthless unless you polish it, grind down the inner chainring mount things, and find a matching or similar arm on ebay, and make it trackish. or get 52 and 42 rings.
Wonder if it’s the same arm length as jacques’ NDS arm. That’d be pretty funny/crappy if somebody ended up with both of them on a bike just to realize on the first ride that something feels a little strange.