This is a regular dies trial piece, struck in brass, of the 1908 St. Gaudens design with the No Motto reverse used in 1907-1908. These are listed in Appendix A in earlier editions of Judd.
These were flattened by being passed through rollers removing most design details except for the edge device which is still sharp on these. The illustrated example is ex Scotsman Auctions 10/05, Heritage 4/18
Photo courtesy of Scotsman Auctions.