1929 REGISTERED INSURED MAIL LONDON TO PRAGUE WITH 5S SEAHORSE (SG416). Good KGV 4½d carmine registered envelope, sent insured mail London to Prague, Czechoslovakia with fine 5s rose-red Bradbury Wilkinson Seahorse (SG416) and 9d olive-green (SG427) with good strikes 'REGISTERED/LONDON CHIEF OFFICE' oval date stamps 18 DEC 29. On reverse 'PRAHA' date stamp 20 12 29. Very scarce usage. (Ref 139706).
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