Furlong MZ
Note the fully enclosed chaincase, which is what Peter Furlong made his name producing, as aftermarket fitments to motorcycles of all kinds. Ironically, MZs were one of the rare marques which fitted fully enclosed chaincases to all their models as standard!
November 2012 update: Currently in bits with owner Andy Tribble after spending several years with John Bruce, who made some modifications for Andy. PNB