1991 Mt. Rushmore 2 coin set

These coins were issued to commemorate the 50th anniversary of Mt. Rushmore. The monument to presidents Washington, Jefferson, Roosevelt, and Lincoln, carved out of the side of a mountain by Gutzon Borglum. The set contains a proof, 90 per cent silver dollar and clad half dollar, in original mint presentation case with certificate of authenticity. Numismatic News lists it at $60.00 retail value. My price, including shipping, $50.00