The original and genuine funeral urn medals are extremely valuable and can fetch hundreds, even thousands of dollars. However these are dated from 1799 so it will not be the correct information for the coin that you have. There are many discussions and debates on the internet about the value of a 1789 George Washington coin. Many individuals who have found coins similar to yours have noticed that on further inspection it is noticeable that the coin is in fact just an ornament. If your coin has a whole at the top and is reasonably thing then it is likely that it is a decorative coin used for lampshades or clothing. Most say that coins such as these are tokens. They were privately minted around the time of the bicentennial. Some have the same image of George Washington on both sides while others have a different obverse. You may be able to sell it on for a few dollars but not much more.
The United States Mint still sells some George Washington medals online at catalog.usmint.gov/webapp/wcs/stores/servlet/ProductDisplay? These have a portrait of George Washington on the obverse with the inscription ‘George Washington President of the United States 1789’ centred along the border of the medal. On the reverse of the medal is the peace and friendship symbol with two hands clasped in token of amity. On the cuff of the left wrist there are three stripes with buttons, each button carries the American eagle. The other wrist is bare and above the hands are the pipe of peace and the tomahawk crossed over one another. The medal is designed by Pierre Simon and John Reich and is minted in Philadelphia, although the coin does not have a mint mark. The composition is 90 per cent copper and 10 per cent zinc.
The United States Mint still sells some George Washington medals online at catalog.usmint.gov/webapp/wcs/stores/servlet/ProductDisplay? These have a portrait of George Washington on the obverse with the inscription ‘George Washington President of the United States 1789’ centred along the border of the medal. On the reverse of the medal is the peace and friendship symbol with two hands clasped in token of amity. On the cuff of the left wrist there are three stripes with buttons, each button carries the American eagle. The other wrist is bare and above the hands are the pipe of peace and the tomahawk crossed over one another. The medal is designed by Pierre Simon and John Reich and is minted in Philadelphia, although the coin does not have a mint mark. The composition is 90 per cent copper and 10 per cent zinc.