I get bikes that have been worked over by clueless owners. This one looks like it got attacked with a hammer and chisel. Trying to remove the bb. The bearings were chunky. Left end of the bb axle smashed over and useless. This is the left side cartridge ring. My bet is the former owner never saw a bicycle tool of any sort. Just hammers and vise grips.
700c bolt on wheels. Caliper brakes. Wrong size seat post. 1 shifter trashed, the other gummed in to inaction.
Rear derailleur torn off. Direct chain so tight the drive train won't move. Both pedals garbage. Walmart handelbars.
Dismanteled, most parts binned. The frame is okay so it could be a rebuilder. At least they didn't saw off the brake mounts.
The source says I should hire him to fix bikes. Hummm, No.