The Unique model Rr51 (aka model 51) was a revision of the Unique Kriegsmodell first produced during the WWII German occupation of France. After liberation, Unique returned the Kriegsmodell to production (as the model R) for the French military from 1945-1951, when the Rr51 began production. The most obvious difference is that the Kriegsmodell/R has a long extractor while the Rr51 has a short extractor. The same pistol was made in .380 as the Fr51. The .22LR version (initially called the model RD, later the model 52, and sold in the US as the "Ranger") was used by the French gendarmerie as a training pistol, since it duplicated the .32 service pistol in all but caliber.
According to French sources, the last delivery of Unique model Rr51 pistol were 640 pistols shipped to the gendarmerie in March of 1998; by this time, the Unique pistols were primarily used by auxillary or reserve forces. Unique itself closed in 2004.
Originally Posted by macduff
Very nice...I've had three Unique 22's over the past 30 years or so...Heavy and built to last and still very popular over here in Europe...I probably put 10-12000 rounds of all sorts of 22lr ammo (including some 'furry' ancient stuff) through my original model 'L' and it took it all. Many provincial French Police Forces used Unique Model 51 pistols in 32cal right up to the late 70's. Not too accurate over 10yards but totally reliable and fun to shoot...enjoy