1899 $5.00 Silver Certificate & 1928 $20.00 Gold Certificate

This will give you an idea http://www.uscurrencyauctions.com/prices.htm
John1

Fine (F)

A well circulated note with rounded corners, wrinkles, multiple folds and a rough edge or two. Colors will be good and the paper will be reasonably clean.

Very Good (VG)

This note will show signs of significant wear, with heavy folds, the paper will have lost its crispness and will be limp. The note may be lightly stained or soiled, the edges will be rough, and there may be a tear in the paper. Colors will be somewhat faded.

Good (G)

A heavily circulated note. This note will be heavily wrinkled and creased, usually soiled, the colors are dull, the paper limp, and there may be multiple tears or pinholes, or small pieces missing. Generally a "space filler.

G-VG at best. But keep in mind I am not very good at grading.
John1