Mexico, (Chihuahua) Chihuahua Sub-Offices. 2 covers; 1849 folded letter sheet with red Valle De San Bartolome two-line postmark (Yag-Bash CH11) and matching "2" rate handstamp, 1851 folded letter with red Cosiguariachi two-line postmark (CH51) with manuscript "2" rate, Very Fine. Estimate  $100 - 150. $0 (Image)