Mexico, 1869-70 "Sello Negro" Covers. 15 covers; towns including Sisal, Mazatlan (746), Matamoros (732+733A), Veracruz, Chacaltianguis (1775A+1776), Toluca (1669), Chihuahua, Yguala (1845), Zacatecas, etc.; clear full strikes throughout, few cover flaws, overall Very Fine. Estimate  $300 - 400. $0 (Image)