I came across a forum post on a obscure Russian made revolver called by the uninspired name of the "AEK 906". Out of curiosity I searched a bit more and found this page briefly describing the gun in both its 9x18mm and 9x19mm variants. What makes is unusual is, as you can see from the image below, it fires from the bottom chamber rather from the top like a conventional revolver.
The weird part in all this is that the AEK 906 was also known as the "Nosorog" which is Russian for "rhinoceros"! I wonder if the folks at Chiappa Firearms knew about that when they named their new revolver the "Rhino".