What is the value of a 1915 US 20 dollar gold piece?

Answer 1

Look below for the date. It could be either blank or it could be a small S.

As of 6/2012 Numimedia lists these as the approximate values:

No mintmark (Philadelphia):

Moderately worn - $1,870

Slightly worn - $1,880

Almost no wear - $1,930

Uncirculated - $1,980 to $59.380 depending on quality

"S" mint mark (San Francisco):

Moderately worn - $1,870

Slightly worn - $1,880

Almost no wear - $1,930

Uncirculated - $1,980 to $30,550

If you have a proof version realistically it's probably worth up to $13,000. However the value can be as much as $106,000.

Note: These values are approximate and not exact. They will change over time.