China
People's Republic silver Four-Piece Certified Panda Proof Set 1991, 1) 10 Yuan (1oz) - PR69 Ultra Cameo NGC, KM386.22) 10 Yuan Piefort (2oz) (10th Anniversary) - PR66 Ultra Cameo NGC, KM3563) 50 Yuan (5oz) - PR68 Ultra Cameo NGC, KM3534) 100 Yuan (12 oz) - PR67 NGC, KM354All are Choice Cameo Proofs. Included is the original case, with COA #68 of only 650 sets.
Estimate: 1500-2000 USD