Have a twenty D gold coin with an American eagle turn over and woman wearing a crown with the date 1776 What is it and how much is it worth?

The U.S. released its first $20.00 gold coin in 1850, so a 1776 dated coin is not a Mint issue coin. This may be a bullion coin of some type or a fantasy piece. Take to a coin dealer or collector, it needs to be seen for an accurate assessment.