NGC $1 40% Silver Eisenhower Dollar Experimental Rinse Ex-San Francisco Hoard UNC

NGC Eisenhower dollar 40% silver type-2 planchet and with an experimental rinse, and with the letters "DL" carved into the planchet. This was something the Mint placed on the coin, and was part of some experiments the Mint was doing.

Unique for what it is, although other experimental 40% silver planchets of other types are known.