1970 UNDERPAID MAIL FRANCE TO DIDCOT BERKS. Envelope (218 x 111) Paris to "Atomic Energy Research Establishment, the Librarian Harwell-Didcot, Berks, Angleterre" with French .30C cancelled PARIS 13-3-1970. Postage underpaid with UK boxed "INSUFFICIENTLY PAID...10d TO PAY" charge mark with postage dues 6d and 1d x 4 cancelled REGISTERED/DIDCOT BERKS date stamps 18 MR 70. (Ref 111280).
