CHINA. Four Piece Partial Proof Set, 1992. Inventions & Discoveries Series. Pieforts. NGC PROOF-69 ULTRA CAMEO.
KM-P21 & P23/P25. Includes: four silver 5 Yuan Piefort pieces. The ancient shipbuilding is missing from the set. KM-P23 (The first seismograph) has an incorrect Krause attribution on the NGC insert. A nicely matched brilliant group. NGC PROOF-69 ULTRA CAMEO.
Estimate: $1500.00- $2000.00