I had a 28" 20ga A&F Zoli-Rizzini. Got it from Jack Dudley, back when he was running La Becasse.
Those Z-R's are nice guns. Most were double trigger non-ejectors with a very shallow round knob grip and splinter forend, although there were higher grade versions with ejectors, and some had beavertail (or at least semi-beavertail) forends. $750 for a 12 in nice shape, I'd say, is a very good buy. If it were a 20, it'd be a steal; 28ga, highway robbery.
Several years back, a guy I used to shoot with showed up at the gun club with a Z-R 28ga. Paid something like $300 for it. Told him I'd give him $400 on the spot. (Wasn't sure he was serious about selling and would have offered him a bunch more if he had been.) He ended up taking it to a gunshop, and they gave him a new Benelli autoloader, a soft case, and a bunch of other stuff. The 28's are real wands, and the 20's are darned nice handling too--not that there's anything wrong with the 12's.