Entire Letter charged 3d postage to DARLINGTON with 2/line NEW/CASTLE unevenly struck postmark on Reverse, small holed area on flap where seal opened, filing note added on Obverse, the writer acknowledging a remittance.    NORTHUMBERLAND, DURHAM COUNTY.   PLEASE VIEW OUR EBAY SHOP FOR MANY MORE BUY IT NOW AND AUCTION ITEMS - MORE ADDED REGULARY - PLEASE LEAVE FEEDBACK - BOOKMARK OUR EBAY SHOP AND RETURN OFTEN.