There are several tips that may enable one to suspect that a signature is an Autopen. Look for these signs:
a shaky signature, which indicates movement while the machine is in operation
a light signature, especially one that does not have variation in pressure as seen by an indentation in the paper when viewed in the proper light
abrupt pen stops
a “drawn†look to the signature
Other mechanical devices have been used that are similar to the Autopen. Thomas Jefferson invented a machine called the polygraph, which was a pen attached to a framework onto which other pens were attached, enabling the user to sign many documents at once. Harry Truman used a later incarnation of this machine to sign checks in the 1930's. In the 1970's there was another machine in use called the "SignaSigner" which enabled full pages of text to be mass-produced, but fortunately the company that made it went quickly out of business. Jimmy Carter reportedly was a user of the SignaSigner.

RYAN J.
