The J. P. Sauer & Sohn Bär Pistol, while made at the Sauer factory in Suhl, in Eastern Germany, was designed by a Swiss named Burkhard Behr, and it is thought that the name of the pistol, “Bär” meaning “Bear” in English, was a play on his name, although it could pertain to the flat loading mechanism, not truly a “cylinder” but rather a flat, rotating bar.
According to White & Munhall, the 7 mm Bär Cartridge was actually patented in Gemany on November 2, 1897, by Fräulein Balcerie Schlapal of Zurich, Switzerland. The first caliber for the pistol was that special 7 mm centerfire cartridge made for it, followed by a version chambered for the 6.35 mm (.25 Auto) cartridge. I do not know how many of these were produced, but by production standards of relatively modern handguns, the number was small. I have a picture of one of these Bär Pistols in my files, a 6.35 mm version, with a serial number of 3293. Production of the pistol is reported to have been discontinued “before World War One.”
Their is likely an old Sauer trademark on the gun, which is a caricature of a “Caveman.”
More information can be found on the pistol in these references:
“Handguns” magazine, issue of December 1997, Pages ll-12
“The American Rifleman,” Questions and Answers section, issue of June 1964, page 89.
Relatively detailed information on the 7 mm Bär cartridge can be found on Page 16, “Center Fire Metric Pistol and Revolver Cartridges,” by Henry White and Burton Munhall, published in 1948. The cartridge was made in several loadings, including Ball, Blank, Tear Gas and signal flare. Perhaps others, this is our of my field so I have no specimens of this caliber at hand.
Hope this is of help.