Complete folded letter datelined 'Zacatecas, Octubre 10 / 1862' sent by forwarding agent with fine strike of oval 'F. CLAUSSEN Y CA. TAMPICO' agents cachet in blue on reverse to the British P.O. at TAMPICO with fine strike of TAMPICO cds in bright red dated OCT 29 1862 also on reverse. Addressed to FRANCE with '16' decimes rate marking and boxed 'G B 1F 60c' accountancy mark both on front and LONDON transit cds and various other French arrival marks on reverse. A fine & rare cover.