Mexico, (Chihuahua) Guadalupe y Calvo, three covers with letters dated 1842, 1843 and 1847, each with a differing variation of (YB CH61), all 3r rate with 2 unlisted in Yag Bash, with additional Mineral de Jesus Maria (YB CH80) + 1r rate both in red, 20 May 1856, complete letter, Esteban Benitez archive, Very Fine. Estimate  $300 - 400. $0 (Image)