(xposted in SSFG)

I picked up a crankset at work today for next to nothing (yay "junk" bins). It's clearly meant for track use, 48T, 1/8" and 165mm. The only identifying things besides the usual crankarm junk is "Sugino No. 3". Theres some more details to it, such as the peculiar chainring mounting. It appears to have a riveted chainring, but the spider says 46-48T, implying the ring capacities? I haven't bothered to measure the BCD yet, as I haven't even figured out how to change the rings yet. I'd post photos, but I'd rather prefer information on this Sugino No. 3 as a whole.