Mourning cover front franked with strip of three 1910 5c orange (SG 80) tied by SAN JOSE cds's dated APR 28 1923. Addressed to UK with boxed 'PORTO' marking and hexagonal 'T' tax marking with unframed '1½d F.B.' tax marking of Great Britain and added 1914 1½d chestnut GV 'Postage Due' issue tied on arrival by LONDON cds. Subsequently re-addressed to GERMANY. An unusual item.