£220 - £300
CIVIL CENSOR MARK/INSURED MAIL - OPORTO: 22 Sep. 1916 insured env. from Oporto to London franked 19c with green rectangular Porto censor mark no.15. 22 SET. 1916. Most unusual in having 4 x "CENSURA POSTAL PORTO" wax seals. Only a handful known to exist.
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