China
People's Republic Proof Four-piece silver Summer Olympic Piefort Set 1980, 1) Archery 15 Yuan - PR66 Ultra Cameo NGC, KM-P112) Wrestling 20 Yuan - PR67 Cameo NGC, KM-P123) Equestrian 30 Yuan - PR68 Ultra Cameo NGC, KM-P134) Football 30 Yuan - PR68 Ultra Cameo NGC, KM-P14All are sharply defined, with only tiny marks and a hint of golden patina.
Estimate: 7000-8000 USD