This one is being sold tomorrow. https://www.collectors.com/coin/bri...coin-silver-king-william/-6355118926767214536
Granted, it isn't a double die, but its condition is better than yours. You might use the sale price for this coin as a guide. Premium value, if any, would have to be created by the convincing quality of your ad since there doesn't seem to be a current market (supply) of your coin variety.
Don.......