I have a spare mid 80s (?) specialized 'track' crankset, looks to be the same as a Sugino 75, and was supposed to be cold forged... its in very good condition. was used on a 10 speed Trek TX300 frame, with 52:42 rings, also Specialized. 144mm bolt center.
Has a specialized brand bottom bracket that looks like is made from high chrome tool steel, and has not a spot of rust or corrosion and only the slightest sign of bearing tracks on the cups, with no dents. the BB is brit 68mm and I believe the spindle is 107.5mm (need to double check). the rings have some signs of usage, there's a tooth tip chipped off the small ring, and a couple gouges from blown shifts. no shoe wear on the arms.
I found this crankset on velobase.com. it was sold as a racing crankset. cold forged. looks a LOT like a sugino 75.
hey, a friend of mine (in another state) is thinking he can use it on his urban fixie, I believe its a Jamis, with a 48T ring, probably sugino. since I don't have the bike it came off, I thought I'd try and measure it.
the spindle is, as advertised, 107mm.
I installed the drive side arm w/ rings onto the crank (clean and dry, hand pressure, bolt finger tight). I stood this assembly up on the other end of the spindle on a flat level surface, and used my dial caliber's depth gauge to measure from the top of the big ring to the table, and the top of the bottom ring to the table. the rings are 3mm thick. top of the big ring was 103mm... minus 1.5mm (half the ring thickness) and minus 53.5mm (half the spindle length) gives me 51mm. the small ring was 97mm - 1.5 - 53.5 == 42mm
I believe the standard track chainline is 42mm +/- 2mm, although I assume this is largely a function of the sprocket position relative to the rear hub, but I don't know much about fixies or track bikes.