The best way to do that is to take it to a coin collector.
1848. Silver. Twenty. Dollar. Coin
The British do not have a Twenty Dollar coin.
The denomination of the gold McKinley Memorial coin is One Dollar not Twenty. Value is $700.00-$800.00
Go to any coin shop or coin show.
With an "S" mint mark on the reverse, about $1,000 for its gold content. With no mint mark, $6,000 or more. But any such coin should be inspected by a professional to ensure that it's not counterfeit or altered.
There is only ONE U.S. 1849 Twenty Dollar (Double Eagle) gold coin. It's a national treasure that is in the Smithsonian collection. The coin is priceless.
Please look at the coin again, the US did not coin $25 dollar denominations in 1896.
Both
4000.00
It depends on if it has a letter above it or not. If their is not a letter it can be worth $1100. If their is a s it is from San Fransisco and can be worth at least $4000. If it has a d it is a 1927-d double eagles which are so rare you should have it examined by a certified appraiser to determine if it is counterfeit. Good luck..
New Zealand only issued a Twenty Dollar coin in 1995 and 1997.
The first Trade Dollars are dated 1873. If this coin is a Trade Dollar dated 1798 it's counterfeit.