Mexico, (Mazatlán) Rosario, Mineral del. Red fancy oval date stamp on 1839 folded letter to forwarders in Veracruz, endorsed "Con Cartas pa Ultramar", reverse with matching "10" rate; reinforced folds, Very Fine, an interesting outside cover for letters to be fowarded to Europe, postmark unlisted in Yag Bash. Estimate  $400 - 600. $0 (Image)