When was the last US silver certificate issued?

The last silver certificates were $1 notes bearing the date and series 1957 B. Despite the date, they were actually issued until March 25, 1964 and bear the signature of C. Douglas Dillon.

Because of the rising price of silver, starting in 1963 dollar bills were issued as Federal Reserve Notes that did not require 1-for-1 backing with precious metal. The two series were briefly co-issued during that year.

Silver certificates are no longer redeemable for silver metal, and are treated exactly the same as Federal Reserve Notes.