Similar in appearance to 1st Issue, this 2nd Issue variation has several notable differences that make identification rather simple. Sides of frame on 2nd Issue are flat not rounded as on 1st Issue. Sideplate is irregular in shape—not round like on 1st Issue. Barrel is 3.1875" in length and stamped "Smith & Wesson" while cylinder is marked with three patent dates: April 3, 1858, July 5, 1859 and December 18, 1860. There have been 2nd Issue noted with full silver or nickel-plating. Smith & Wesson manufactured approximately 115,000 of these revolvers between 1860 and 1868. Serial numbers started around 11000 where 1st Issue left off and continued to 126400. Approximately 4,400 revolvers marked "2D Quality" on barrels. These revolvers were slightly defective and were sold at a lesser price. They will bring approximately 100% premium on today's market. Early production with a straight-edged sideplate, usually found in the 11000 to 12000 s/n range, will bring double values.