He's got a "29" in laurels on his kepi and an "NY" belt plate. He is armed with a pistol which hangs off his belt and strikes a confident pose with his arms crossed.
The 29th New York was mostly comprised of Germans and got the nickname "Astor Rifles" or "First German Infantry". This image is 1/9th plate size, no bends, mint condition, in a nice full thermoplastic case. I have no info on who he is but maybe someone can figure it out. The item "Mint Armed Civil War soldier tintype in thermoplastic case" is in sale since Thursday, July 02, 2015. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs". The seller is "theoldjostler" and is located in Basking Ridge, New Jersey. This item can be shipped to United States.