1929 REGISTERED INSURED MAIL LONDON TO PRAGUE WITH 5S SEAHORSE (SG416). KGV 4½d carmine registered envelope from London to Prague in Czechoslovakia uprated with fine 5s rose-red Bradbury Wilkinson Seahorse (SG416) and 9d olive-green (SG427) cancelled 'REGISTERED/LONDON CHIEF OFFICE' oval date stamps 31 DEC 29. On front red 'INSURED' label, on reverse 'PRAHA' date stamp 4 1 30. Very scarce and unusual usage. (Ref 139687).
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