1937 UNDERPAID MAIL BELGIAN CONGO TO MANCHESTER. Envelope, some imperfections from the Belgian Congo to Manchester with Belgian Congo 1.5F cancelled COSTERMANSVILLE date stamp 21 7 37, postage underpaid with 'T' tax mark and UK '2D/I.S.' charge mark with 2d postage due cancelled NEWTON ST/MANCHESTER date stamp 24 JU 37, one cancel must have error of month. Unusual commercial mail. (Ref 118950).