This scarce and unique pistol design is based on the French Delvigne patent 12683 which was issued on 22 January 1852, with this example having been produced by Falisse & Trapmann in Liege, Belgium. The Falisse & Trapmann "F.T" marking is on the left of the grip frame and "FT/D" is marked on both the back strap and inside surface of the lever. The lever and back strap are also marked with the serial number "115". The design is very interesting in that turning the rotary lever counter clockwise withdraws the breech from the barrel, allowing it to tip up for loading, and the reverse operation locks it. There is a cocking lever on the butt, which cocks the under hammer when pushed forward, and the trigger is on the front strap. It is fitted with bead and notch sights and a pair of smooth walnut grips.