if I remember when I got it years ago the paper said 24 carrot gold I don't have the paper work any more with all my moving stuff gets lost it don't say on the dollar.
I am pretty sure it is only gold plated and not solid. By the way that is a copy of a $20 gold piece and not $1. Also 1933 is extreemely rare as the were not actually issued but rather someone snuck a few out of the mint and the mint melted all they had.