1956 UNDERPAID MAIL HARPENDEN TO LUTON. Envelope from Harpenden to Luton with 1½d Wilding cancelled HARPENDEN/HERTS 4 JNE 1956, postage underpaid with "1D TO PAY/461" charge mark in green with 1d postage due cancelled LUTON/BEDS 5 JU 56. (Ref 105964).
