Mexico, 1868, 50c Black on Yellow, Lagos, Half Used as 25c. Imperf, Tepatitlan with Lagos name overprint, letter in English dated and docketed 21 April 1870, Schatzkes #695, likely a unique letter, Very Fine and choice, 50c bisects are known from Durango and also from Lagos and Zacatecas - all rare; signed John Bash, with 1995 MEPSI certificate. Scott No. 62c  Estimate $1,000 - 1,500. $0 (Image)