How could ivy baker priest sign 1935 silver certificate?

Ivy Baker Priest served as the Treasurer of the United States from 1953 to 1961, but she did not sign the 1935 silver certificates. The 1935 silver certificates were signed by George M. Humphrey, who was the Secretary of the Treasury at the time. The 1935 series is well-known for its blue seal and is often collected for its historical significance rather than for any association with Priest. Ivy Baker Priest's signature can be found on currency from later series issued during her tenure as Treasurer.