Well done Robin - you have completed your replica and it works!

More good news for you - I have found a mint ( as new) handbook for the Model 75 Match Air Rile complete with warranty document.

This looks like a new and un-read copy and the warranty information is blank - so maybe you could try to register the warranty on your "new build" to see how good the German sense of humour really is

This handbook does not have either the Original or Diana badge/logo printed on it, so maybe you could produce your own "Robin Replica" logo and keep it with your (almost) unique Model 75.