I recently bought a used MZ Mastiff and have just finished restoring it (it was a bit of a wreck). The only thing I've been unable to do successfully so far is bleed the front brake so that the lever is firm (at present it compresses right back the handlebar requiring very little force)...
It's in great shape. Never crashed or worn hard. Tires are nearly new, sport cross touring.
Now I just can't find the time to ride it.
If you have questions, let me know. Phone is (810) 348-8010
Odometer is in km.