This green U-171A Pittsburg haystack was used on a line near Waco, TX. The glaze is a bit unusual as it is much thinner than other green haystacks. The head has white areas showing through the thin glaze and there are some thicker blobs on the back. The condition is mint except for 3 tiny flakes at the pinhole. It is a rather unique green haystack. $25 plus $10.70 flat rate Priority box.