This early advanced prototype semi-automatic pistol was patented by Benjamin Orman under British patent number 14,746 dated June 24th, 1912, as well as U.S. patent number 1,128,180 filed June 23rd, 1913 and granted February 9th, 1915. It utilizes a short recoiling barrel, two-lug rotating telescoping bolt with a threaded shaft, an accelerator lever mounted in the left of the chamber that pivots upon firing in order to launch the bolt carrier rearwards, which then unlocks the rotating bolt. This unique pistol demonstrates an extremely early use of lightweight cast aluminum in firearms, with an aluminum frame and bolt housing. The barrel, chamber, bolt and small parts are made of steel. Fixed blade front sight and notch rear sight. Rotating safety lever on the left of the frame behind the trigger that acts as a trigger block when engaged. The serial number “4C” was later applied to the left frame for importation purposes, and a Simpson Ltd. import marking is stamped on the underside of the frame. "Crown/V" London proofs marked on the barrel, top of the chamber, left of bolt carrier, and on left of the bolt housing. Fitted with a magazine drilled with six indicator holes. Provenance: The Dinely Collection; The Dr. Geoffrey Sturgess Collection; Property of a Gentleman

Fine, with smooth brown patina on the originally in-the-white barrel and chamber, strong traces of original blue finish on the bolt carrier, trigger and safety lever, with bright surfaces on the aluminum. Grips are also fine with some light handling marks. Mechanically excellent.