La Costilla C.T., July 1/66, manuscript postmark on cover to Taos, N. Mex., franked with manuscript canceled 1861, 3¢ rose; cover with some contemporary notation and slight reduction at left, Very Fine, one of two known examples of the La. Costilla manuscript postmark from the territorial period. Estimate  $750 - 1,000. The La Costilla post office was established on November 13, 1862. In 1872, a re-survey of the Colorado and New Mexico border determined that the village of Costilla was located in New Mexico Territory resulting in the transfer of the post office on October 21 of that year. $0 (Image)