From the seller:
Green silk plaid fancy bodice dating to the 1860s. Front hook and eye with silk covered buttons, lined with stays, fancy ruffles on sleeves. Museum deaccession with staining in arm pits and scattered age/storage marks. Chest measures 34" waist 22" length 14", sleeves 19".
The black and white dress in the fashion plate above has similar sleeve trim placement. I'd put this at the tail end of the American Civil War.