Invented by Burkard Behr and made by Sauer. This was Sauer's first modern small pistol. It has stacked barrels (over/under configuration) that allow the shooter to fire two shots, rotate the barrel and then fire two more shots before loading. It was first patented in Germany in 1897 and in the USA in 1899. It shoots the 7mm Bär cartridge only. (DO NOT ATTEMPT TO FIRE THE .25 ACP/6.35mm CARTRIDGE IN THIS PISTOL.) It was made from 1897 to 1911 or 1912. Some pistols have Bakelite grips; some have diamond-pattern checkered wood grips. A case extractor rod screws into the bottom of the frame. No triggerguard. Note: Add $150 for original box and instructions.