I have a number of "SILVER CERTIFICATES" printed as late as 1958 which are One Dollar Bills and supposedly redeemable for one Silver Dollar. As to that promise..., it is only a little better than a Confederate Dollar Bill.
Weren't they printed up until 1964? And allowed to be redeemed in 1968 for silver bullion? I also have a few of them, will need to check the dates but I think they were early 1960s.