There was an I.A.Henckel gunsmith in Berlin, documented "about 1850". Notice, the gun is obviously built with a breech action of the Gastinne, Renette design that is most often ascribed to Collath. Collath merely used this breech action combined with his own hammerless locks. This is a “slide and tilt” action. The side turning underlever works an eccentric cam. This cam pushes the barrels back to the standing breech and locks them. On opening, the barrels slide forward a short distance, thereby disengaging the breech. Now they are free to drop open around a small pin at the tip of the foreend. You may read the story of this breech action in Der Waffenschmied # 45”, page 4, a publication of the German Gun Collectors Associaton,
www.germanguns.com . This issue on Collath guns is available from the GGCA bookstore.
As Henckel combined this breech action with conventional back action hammer locks and “modern” slant strikers of the Schneider/Daw type for “modern” centerfire cartridges as we know today, I tend to date the gun to 1865 to 1880.
