I'm no expert, so I can't date the uniforms or provide more information, but if you have any expertise please feel free to share. Appears to be a group of recruits posing before setting off for the war. Interesting to wonder what battles they saw and what became of them. Original mat is well worn as shown.
For size reference, the frame is an 11 by 14. The item "Original Civil War Picture -Beautiful photo of Soldiers before Battle- large CDV" is in sale since Monday, June 25, 2018. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs". The seller is "threat-level-midnight" and is located in Lawrenceville, Georgia.This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.