£400
1876-78 Double rate covers sent via Southampton, charged the deficiency + 6d, a 1d pink stationery envelope with circular "OVERLAND POSTAGE / DUE / AS / 14-6" (equivalent to 1/5) but returned to London with red boxed "SENT BACK TO ENGLAND / WITHOUT A REASON / FOR NON DELIVERY", the 1876 cover from Dalkey, Ireland, franked 1d strip of six with circular "OVERLAND POSTAGE / DUE / AS / 10". (2).
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