For your consideration, Vintage - Square - Rippled - Mint Green - Drip Glaze - Signed 312 on the Underside This piece is in excellent vintage condition with no visible flaws. Marked 312, but I believe this piece to be USA pottery. Please see photos for measurements. Comes from a clean, smoke free home. Vintage - Square Rippled Mint Green Drip Glaze Signed 312 On The Underside