I have one exacly like it (shimano) but don't know what it came from originally, it was on my girlfriend's commuter for a while which as a 1980s Norco Sport that had sustained a front end impact at some point in it's life and converted to a 15 speed from a 12, it had a steel triple crank, 165mm, and a 165mm alluminum crank on the left. Still trying to find a decent 165 triple to match up with for her current commuter.