The Liberty Series was issued from 1954-61. It included definitive stamps with denominations ranging from 1/2¢ to $5. (It would be the last 1/2¢ definitive stamp issued by the U.S.) The Liberty Series was generally replaced by the Prominent Americans series beginning in 1965. However, the 2¢ Jefferson and 25¢ Revere coil stamps were reprinted many times and sold well into the ’80s.