#63 1c Blue, Two Vertical Pairs, Tied on Polytechnic College of Pa. West Penn Square 1861 Advertising Cover

Two strikes of Philadelphia Pa Jun 12 1861 circular datestamp, addressed to Bristol, Pa. Rated to prepay the 1c to the mail carrier fee plus 3c postage. U.S. Penny Mail backstamp. Small faults and tears on stamps and small cover with crease and small tears.