Manufactured from 1857 to 1860, with the top of the barrel rib marked "SMITH & WESSON SPRINGFIELD MASS." and the cylinder is marked with the 1855, '59 and '60 patent dates, (faint). The back strap is period inscribed "J. B. Simpson N.Y.". The revolver has a brass blade front and notch rear sights, the entire revolver is silver plated and is fitted with smooth two piece varnished rosewood grips. Complete with an original Smith & Wesson Gutta Percha case with decorative carved lid with image of a Number One revolver and "MANUFACTURED ONLY BY/SMITH & WESSON,/SPRINGFIELD MASSACHUSETTS". The inside of the lid has decorative maroon velvet and there is dark green velvet on the bottom and a 56 round bullet block. Writer did an internet search on a J.B. Simpson and only found an individual from that time period, (1846-1928) from Illinois. More research may prove interesting.