These are Series 1923 $1 Silver Certificates, commonly nicknamed “horse blanket” notes because they’re much larger than modern U.S. currency. They are genuine collectible U.S. paper money with blue Treasury seals and blue serial numbers.
From your photo:
* Top bill: Very heavily circulated with tears, missing pieces, heavy folds, staining, and edge damage.
* Bottom bill: Also circulated, but noticeably better. It has strong creases but appears complete with no major pieces missing.