The "red seal" refers to the Treasury Seal on the far right of the note, which is printed in red ink instead of the customary green. All $5 notes from 1953 through 1963 have a red seal, and all $1 notes from 1957 through 1963 also have a red seal. The Federal Reserve note catalog lists the 1963 red seal $5 note as worth:
* Condition Value
* Fine $20
* Very fine $35
* Extremely fine $65
* Uncirculated $200
* Choice uncirculated $300
* Gem uncirculated $600