Offered here is a 1921 Pilgrim Commemorative. It is graded by NGC as a Gem MS-65. The coin in the above picture is the one you will receive. Pilgrim Tercentenary Half Dollar Coin Specifications. Dallin Composition: 90% silver, 10% copper Weight: 12.50 grams Diameter: 30.6 mm Authorization: Public Law 66-203 Maximum Authorized Mintage: 300,000. Pilgrim Tercentenary Half Dollar Mintages. 1920: 152,112 1921: 20,053.