Gold Lady Case

Gold Lady Case
twenty dollar gold piece made by kellogg and has copy written on back is there any value to this coin?

this coin is in a metal casing to hang from a chain, has San Francisco California and Twenty D around outer edge has eagel with shiel and above eagel it says copy, I have had this coin at least 20 years and its still a beautiful gold color and hasn’t tarnished, the front of the coin has 13 stars around and 1854 with a lady wearing a crown with the words Kellogg & co. on the crown

Take it to a coin shop and find out.

CHiP.s DRIVE LADY DRIVE (Part 1 of 5) 11/10/79 TRACEY GOLD