Just Jim, Roy Jinks can advise you on the originality of the gun, if you can send him pictures of the gun, from all angles and close up pictures of all markings and stampings. These guns were not made by Smith & Wesson, but by various contractors that supplied the parts, and S&W assembled them for shipment to distributors. Shipping records are somewhat vague, especially as to configuration, etc. The known serial numbers of these 1st, 1st,1st variations are ( info from my data base)5,11,21,22,25,39,43,81,97, 197,202 and 213. Your # 149 wold be a new addition, if it's real. There are a couple others that are only parts, or have non S&W parts. These guns have some distinguishing characteristics: Oval brass frame with round side plate, a two-piece hammer, the moveable top of which operates the cylinder stop spring, a flat spring type barrel catch, and there is a flat circular plate behind, but separate, from the cylinder. This plate revolves with the cylinder and was designed to stop fired cartridge cases from rubbing on the recoil shield and jamming the gun. There are five variations of this plate. The top of the barrel rib should have the standard Smith & Wesson , Springfield, Mass stamp. The stocks may. or may, not be numbered inside the right panel with the serial number of the gun. If all parts are original, an assembly number , or symbol, will be stamped on the grip frame, back of the barrel and on the cylinder. On early guns, these marks may be missing. Serial # 149 was made around April, 1858. and probably shipped to J.W.Storrs, NYC, S&W's sole agent. Therefore, if your cylinder has the patent dates you mention, the cylinder is a replacement, as obviously an 1858 gun cannot have an 1860 patent date. Also, if your gun has a bird's head type rounded butt, it cannot be a S&W 1st,1st,1st variation, as they were all square butt revolvers. Ed #15