It measures 60mm tall by 50mm wide. The viewable part of the photo measures about 36mm x 29mm. The photo looks to have a chip on the top left side edge.
It could possibly be a Confederate soldier based on his clothing as he has a home spun shirt but there is no proof of that. Please take a look at all of the pictures for condition. I will do my best to resolve the issue for you. The item "Estate Hair Pin Pendant Brooch Jewelry Ambrotype Possibly Confederate Civil War" is in sale since Sunday, April 7, 2019.
This item is in the category "Collectibles\Photographic Images\Vintage & Antique (Pre-1940)\Ambrotypes". The seller is "alsgt" and is located in Windsor, Virginia. This item can be shipped to United States, Canada, Mexico.