Originally Posted by
dayvurd
some crappy run of the mill no branded crank.
Even more evidence that it's probably not ISO.
You'll want to get a better measure before ordering the new one. Maybe tape it down to a piece of cardboard, and use an upended ruler on each end to make a good mark on the cardboard, and measure between those.
Last I checked, you can get Shimano cartridge bottom brackets in 122mm and 127mm, so it's probably one of those.