One of the most remarkable 'revolvers' that appeared under the Mauser brand name in the 1990s was this contraption.
Labeled the 'Mauser Mod. L22' it was chambered for one (!) .22lr round, making it a single shot pistol, but with the appearance of a revolver. This was most likely made by Umarex, under license from Mauser and most probably for a market where single shot .22lr pistols were easily obtainable by the general public.
The Frame and trommel are made of castings, the barrel and chamber are steel and pressed into the frame and trommel. Fit and finish of the entire product is along the lines of the Umarex / Mauser blank firing revolvers.
The gap between the chamber and the barrel of the specimen shown is so large that I haven't had the need to test fire it yet
Parts and packaging of these L22's surfaced in France, so I expect that French legislation once provided room for this weird, wackey 'revolver'.
This particular example has been proofed in Germany, at the Cologne (Köln) proof house in 1993.