1867, First printing, wove paper: un real on blue paper, horizontal block of 12 with double impression on pos. 3, good to large margins and nice fresh deep colour, unused without gum. The double impression with small hinge thin and some staining toned down, otherwise very fine. This block contains all existing unused copies of this stamp, no other unused copies have been recorded. The greatest rarity of Guadalajara issues. MEPSI certificate (2007)
