1921 UNDERPAID MAIL USA TO LOCHWINNOCH, SCOTLAND/KGV ½D POSTAGE STAMP (SG315) USED AS A POSTAGE DUE. Post card from the US to Lochwinnoch with US 1c cancelled JL 19 1921, postage underpaid with 1d postage due and DUE TO A SHORTAGE OF ½D POSTAGE DUES, ½D POSTAGE STAMP USED INSTEAD - both cancelled LOCHWINNOCH cds's 3 AU 21. Rare usage. (Ref 103932).
