Manufactured by G.P. Foster of Taunton, Massachusetts, Porter's revolving rifles showcased a number of impressive features, with the Second Type fitted with an automatic percussion primer built into the lock plate. Blade front and notch rear sights, both offset to the left to clear the turret cylinder, with the 3-line address and patent markings "ADDRESS/P.W. PORTER/NEW=YORK" and "P.W. PORTER'S/PATENT./1851." on the upper right barrel flat. The cylinder is numbered "245", with "167" on the frame, lock plate, takedown catch, primer cover, barrel and loading lever. Smooth straight wrist stock, with a lever catch on the lower tang and a smooth curved buttplate.

Very good, with a mixed brown and gray patina overall, showing bright wear along the high edges and scattered handling marks. A retention pin is absent from the right side of the frame, and the turret protector has been removed. Stock is very fine, with most of the original varnish, some scuffs, dents and varnish loss. Mechanically fine.