Esjot drives are made in Germany. Exact dimensional tolerance and they last at least twice as long as Asian-made drives. Buy Esjot chain and you get the best possible transmission.
This drive should have a 415 chain.
Esjot manufactured drives for Zündapp, Kreidler, Sachs and a number of other mopeds already in the 60s and 70s.
Note that the dimensional drawing shows a 34 drive, but you get one with 36 teeth