Once professionally authenticated, you would be well advised to offer or consign the coin at auction to get the highest price. An unstruck coin Unstruck blanks or planchets are relatively common. Most retail for a couple dollars or less. There are many types of striking errors. Additionally, a lot of coins look unusual because they have been altered after striking.
Altered coins have no value to coin collectors.
Prices for legitimate striking errors cover a broad range. Minor errors, such as a raised crack, will generally bring little or no premium. Rare, dramatic errors may sell for several hundred dollars. The first step towards determining the value an unusual looking coin is to have it examined by one or more professionals.