25c blue 'Hidalgo' postal stationery envelope with '3679' district number and 'GUANAJUATO' district overprint in black (UPSS #E9, H&G B9b) used with light strike of VALLE DE SANTIAGO FRANCO cds cancel dated FEBRUARY (1880). Addressed to MEXICO CITY with arrival mark dated FEB 1880 on reverse. Backflap missing.