When were silver certificates printed in the U.S.?

Silver certificates were printed in the United States from 1878 until 1964. They were issued as a form of paper currency that represented a claim on silver held by the U.S. Treasury. The certificates were originally backed by silver bullion, and their issuance was part of the government's efforts to promote the use of silver in the economy. The last series of silver certificates was printed in 1957, and they were officially discontinued in 1968.