It does have metal buttons, but not clear enough to identify. The photographer is unknown, but may have been from a traveling studio.
I have had images like this before, with no equipment or weapons and they were usually of captured Confederates. There is nothing on the reverse of the CDV. Under the limited magnification I have, there appears to be a small badge on the front of the slouch hat he is wearing, probably round and the size of a token or coin, but way too fuzzy to make out.
He may have a small portion of a handkerchief sticking out of the open upper third button location, but no other distinctive features to note. Largest dimension is just over 3 1/2 inches by just under 2 1/4 inches. Would look great framed in a CDV pocket from a period album. The item "Civil War Confederate Soldier CDV, Early 7 Button Frock, Trimmed, No Backmark" is in sale since Saturday, March 14, 2020. This item is in the category "Collectibles\Militaria\Civil War (1861-65)\Original Period Items\Photographs".
The seller is "loosecannon6970" and is located in Torrance, California. This item can be shipped to United States, Canada, United Kingdom, Germany, Japan, France, Australia, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Greece, Portugal, Cyprus, Slovenia, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.