Two Cent Revenue Stamped Paper

Everything you'd ever want to know about revenue stamped paper (first authorized in 1862). This site features information about the different types (Type A through Type O) and versions (such as color and imprint variations), as well as numerous high-quality images (and close-ups!). Incredibly detailed, you won't be able to stop looking at these beautifully printed 19th century examples. Cool engravings.