Manufactured between 1906 and 1907 with very few produced. Semi-Automatic pistol with an unique design for 7.25mm Adler cartridge. Striker fired blowback pistol with a 3 5/8 inch barrel. Front large blade fixed sight and rear inverted v sight; serial number is marked under the barrel and on the backstrap. Right of the receiver is marked "PATENT HAEUSSLER / ADLERWAFFENWERKE / ENGELBRECHT & WOLFE". There are matching crown proofs on the right of the receiver and barrel. All metal parts are blue except the trigger, slide, safety lever and fasteners are all bright. Left grip is missing but the right is hand numbered to the gun with a Eagle holding a banner and markers emblem with "FABRIK-ZECHEN". Grip frame is marked with a "V". Eight round capacity single column blued magazine number to the gun.

Very fine (with exception of missing left grip) with 95% slightly thinning original blue remaining overall. Only slight edge wear on the muzzle and minor high point edge wear throughout. Hammer and trigger are gray with scattered slight spotting. The right grip panel is fine; the checkering has handling marks with a tiny crack on the upper edge. A nice example of a extremely rare German pistol.