1939 UNDERPAID MAIL HAMPSTEAD TO MONTE CARLO. Envelope Hampstead to Monte Carlo with KGVI ½d green (SG462) and 1d scarlet (SG463) cancelled HAMPSTEAD 21 MCH 1939, postage underpaid with "T/20" tax mark and superb strip of three Monaco 60c postage dues cancelled MONTE CARLO 23 3 39. A most attractive usage, the 60c Monaco postage dues rare on cover. (Ref 108757).
