J. Cohn and S.W. Marston
Percussion Over and Under Bar Hammer Pistol, By J. Cohn and S.W. Marston, New York.
Circa 1850s.
Serial no. 7; .28 caliber, 4 1/4 inch flat-sided over and under, turning barrel cluster, with brass pin front sight for each barrel; the barrel breech marked on one side J. COHN/&/S.W. MARSTON and NEW-YORK/CAST STEEL on the other side; NEW-YORK on left side of bar hammer, and PATENTED 1851 on the other; scroll engraved, silver-plated brass frame; ring trigger; varnished walnut grips.
Many thanks to "GREG MARTIN AUCTION" for the photos.