What about 2 dollar silver certificates with red seals?

The last $2 red-seal silver certificates were printed in 1896. Nearly all red-seal $2 bills printed after that date are United States Notes, as indicated by the banner across the top of the bill's front.

There's more information on values at the Related Question.

US Notes were bills issued directly by the federal government instead of through the Federal Reserve System. They were obligations of the federal government but did not have silver or gold backing. US Notes were discontinued in the late 1960s as a cost-saving move because they were functionally identical to Federal Reserve Notes.