The 1¢, 3¢, and 6¢ stamps were printed on plates of 200 stamps and cut into two panes of 100 stamps
The 2¢, 10¢, 12¢, 15¢, 24¢, 30¢, and 90¢ stamps were printed on plates of 100 stamps
Perforated 12 - Issued July 3, 1873 - Printed by the Continental Bank Note Company on "thin, hard" whitish paper
The Post Office Officials range in color from gray black to black. The 3¢ Post Office Departmental stamp was also issued in 1879 by the American Bank Note Company on soft porous paper. The stamps are distinguished by paper type, the Continental stamps are on thin hard paper and the American stamps on soft porous paper:
see: Bank Note Paper
Types
Three Cent Post Office Official
Number O49 - Continental Bank Note Printing of the Post Office Department 3¢ stamp
Number O108 - American Bank Note Printing of the Post Office Department 3¢ stamp