Manufactured 1912-1930s. This exact example is photographed on page 869 of "Blue Book of Airguns, Thirteenth Edition". Smoothbore part octagon/round barrel with blade and notch sights (rear sight notch insert absent), marked "MADE IN GERMANY" and "7" on the underside of the barrel. The barrel breaks open for loading at the rear, and simultaneously cocks the spring inside the cylinder, in which a piston pushes compressed air when the trigger is pulled. Circular brass collection tag marked "R.D. BEEMAN/PRIVATE/COLLECTION/1233" hanging from the trigger guard. Provenance: The Dr. Robert D. Beeman Collection