Identification of the 1861-68 24¢
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No grill
REDDISH LILAC
#70
No grill
BROWN LILAC
#70a
No grill
STEEL BLUE
#70b
No grill, thin paper
VIOLET
#70c
No grill, thin paper
PALE GRAY VIOLET
#70d
No grill
LILAC
#78
No grill
GRAYISH LILAC
#78a
No grill
GRAY
#78b
No grill
BLACKISH VIOLET
#78c
9 x 13mm
11-12 x 15-17 points
#99