China
People's Republic platinum 5-Piece NGC-Certified "Inventions & Discoveries" Proof 100 Yuan Set 1992,
1) Ancient Ship Building - PR69 Ultra Cameo NGC, KM410
2) Seismograph - PR69 Ultra Cameo NGC, KM411
3) Ancient Kite Flying - PR69 Ultra Cameo NGC, KM412
4) Compass - PR69 Ultra Cameo NGC, KM413
5) Bronze Age Urn - PR69 Ultra Cameo NGC, KM414
An extremely rare set, each coin being one of only 100 pieces originally minted, and many if not most of the sets having been broken up over the years. As the near-perfect NGC grades suggest, each coin remains carefully preserved with exceptional cameo features and no mentionable flaws. Accompanying the coins are the original box of issue, the COAs with matching serial numbers, as well as the story booklet and replica compass. Together, these make a wonderful showpiece that for modern issues is undeniably difficult to surpass.
HID02901242017
Estimate: 40000-60000 USD