The Regular and Jumbled versions of STAMP ACT were made from scans of cheap commercial rubber stamps. The awkward design of the letters suggests a vintage packing crate. A big font company sells something called Rubber Stamp but this, and my other rubber stamp fonts which can be found on this site, are more like real stamping. The jumbled version has randomized placement.
These fonts have been revised to include two of each uppercase letter, plus numbers, punctuation, and international characters.