Cook Islands. 1963 (11 July) envelope to New Zealand, carried by auxiliary ketch Siren which struck a reef at Avatiu Harbour, Raratonga; stamp floated off, showing blank registration label with "mangaia/cook islands" c.d.s. and accompanied by a duplicate slip from the Chief Postmaster apologising for "any damage and inconvenience caused by the mishap". Very rare. Photo
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Est. £250-300