The ink on the back is from the flat plate printing process. When they took the printed sheets off the press they stacked them on-top of each other. Also the paper and ink looks different because of the different banknote companies that all printed this same (relatively speaking) design. You need to look at whats called the secret marks.
This site should help out a bit with ID's.
it's all on your 3˘ Washington's you've shown-
http://www.1847usa.com/1870/BankNote03c.htmpaper types -
http://www.1847usa.com/BanknotePaperTypes.htmOne more - on secret marks
http://www.uspcs.org/the-1870-93-is...ote-company/ Quote:
"The without grill version of the three cent Washington has an earliest known use of 1 March 1870. It was printed in green with pale and dark green shades also found. About 1.2 billion were issued. Cancellations can be found in black, blue, purple, magenta, brown, red, ultramarine and green.
The grilled version also in green with pale, yellow and deep green shades has an earliest known use of 24 March 1870. It can be found with both the H and I grills. Approximately 50 million were printed. Black, blue, purple, magenta, red, orange, brown and green cancellations have been found."
Posted 03/23/2014 9:38 pm
