U.S. Series 1863 $100 Gold Certificate value?

I forgot to mention, I also have a couple of series 1863 $100 Gold
Certificates in AU+ condition that I inherited from my grandmother
awhile back. The serial numbers are 46302 and 46303. On the front it
has an eagle with an American flag and olive branch and a large "100"
printed in green in the background.It says One Hundred Dollars Gold.
It has a red treasury seal printed in the lower right hand side. Above
the seal is a large ornate circle printed in black with 100 in the
middle. The back of the note has an orange design boarder with One
Hundred Dollars printed in a box in orange.

I don't think they are worth much, a collector offered me $300 for
each note. I thought it was a good deal and I am thinking of selling
them to him. Does anybody know the value of this note? Thanks. Billy