I have several Silver Certificates and was wondering what their value might be? Here's some basic information about each bill;

$5 1934 A - Blue Seal - I68149736A

$1 1928 A - Blue Seal - X67226986A - Has a weird back; Block letters spelling out O-N-E, no monuments or symbolism.

$1 1957 (no series letter) - Blue Seal - Y 95027593 A

$1 1957 B - Blue Seal - S 62622314 A

Any help on the value of these bills would be greatly appreciated. I managed to track down some answers, but everything was inconsistent. The only thing I think I know for sure is that the $5 is worth about $20, but given the inconsistencies on the other bills I'd like to ask someone who can be a little more sure.