This is a Peugeot UO 8 from the 1970s. My problem is recently when moving to the largest gear the chain slips and eventually it will come off the front crank. When researching the problem it seems like the derailleur on my bike is in a different position than ones I see online (red lines). Is my derailleur broken or just needs adjustment?
There is clearly damage to the two plastic gears in the derailleur too which I figured could also be causing me problems.