Un real on grey blue, overprinted 'C.GUZMAN', and 2 reales on white without overprint, used with 'infinity cancel' on letter sheet, docketed 'March 18, 1867', to Guadalajara. Faint filing crease affecting the stamps, otherwise fine. Just 10 covers have been recorded with the "C.GUZMAN" overprint; this is the only recorded with the 'Un real' on gray blue. Certificate MEPSI 1996
