This one might have been altered, not sure. A friend who looked at it said he thought the uniform did not match up to a CS buckle. He is not an expert on these photos but does know some about them. It also has ID info on the inside, that could have been added.
I have done no research on the ID due to time restrictions. It is a really nice image with weapons.The item "Armed Civil War Soldier Ambrotype Photo" is in sale since Saturday, April 02, 2016. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs".
The seller is "ronpv" and is located in Memphis, Tennessee. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, AE, QA, KW, BH, HR, MY, CL, CO, CR, DO, PA, TT, GT, SV, HN, JM.