1 REAL BLUE or ULTRAMARINE
Fourth Period

SAN LUIS POTOSI

1865, JUN 23:  TESTULAN to VERA CRUZ
Franked with 1 real blue in pair and strip of 5, JALAPA district

LARGEST KNOWN FRANKING FOR THE ISSUE


1865, SEP 1:  NAZAS to DURANGO
6 Reales postage using pair of 1 real blue
and 4 reales green.

1866:  SOYANIQUILPAN to MEXICO
Franked with 1 real blue.
a

1865: VALLE DE SANTIAGO to GUANAJUATO
With pair of 1 real blue.
a
a

1864, APR 26:  LEON to MEXICO
1 Real blue, 2 reales  yellow and 8 reales red 
for  11 reales postage  for 2 1/2 ounces weight, 
delivery beyond 17 leagues distance.