1930 REGISTERED INSURED MAIL LONDON TO PRAGUE WITH 2/6 SEAHORSE (SG415). Fine KGV 4½d carmine registered envelope sent insured mail London to Prague, Czechoslovakia with fine 2/6 red-brown Bradbury Wilkinson Seahorse (SG415) and 5d brown (SG425) cancelled 'REGISTERED/LONDON CHIEF OFFICE' oval date stamps 21 MAY 30. On reverse 'PRAHA' date stamp 23 5 30. Very scarce usage. (Ref 139704).
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