1957 UNDERPAID MAIL CORNWALL TO BELGIUM. Envelope Cornwall to Ganshoren Belgium with Wildings ½d and 1d x 2 with light Cornish cancellation 20 MAY 1957, postage underpaid with tax mark and Belgium 2f and 1f postage dues cancelled GANSHOREN 22 5 57. Returned to sender with good strike '3D TO PAY/LDN. R.L.B.' hand stamp. Filing fold clear of stamp. (Ref 118469).