1955 UNDERPAID MAIL FRANCE TO HARPENDEN HERTS. Envelope France to Harpenden with French 15f cancelled METZ-GARE/MOSELLE 18 6 1955, postage underpaid with 'T' tax mark and UK '4D/I.S.' charge mark. On front 4d postage due cancelled HARPENDEN/HERTS date stamp 21 JU 55, filing fold affects postage due. (Ref 113426).