China
People's Republic silver Four-Piece Proof Set 1980, KM26, 34-36. Comprised of three 30 Yuan coins commemorating soccer, equestrian, and speed skating with one 20 Yuan coin commemorating wrestling. All for the 1980 Lake Placid Olympics. With case of issue and COAs for KM26, 34, and 35.
Estimate: 150-250 USD