China
People's Republic 5-Piece Lot of Certified Proof "Inventions & Discoveries" 5 Yuan 1994 PR69 Ultra Cameo NGC,
1) "Recording of Comets" 5 Yuan, KM627
2) "Tuned Bells" 5 Yuan, KM628
3) "Silken Fabric" 5 Yuan, KM629
4) "Chain Water Pumps" 5 Yuan, KM630
5) "Sailing Masts" 5 Yuan, KM631
Inventions & Discoveries series.
https://coins.ha.com/itm/china/china-people-s-republic-5-piece-lot-of-certified-proof-inventions-and-discoveries-5-yuan-1994-pr69-ultra-cameo-ngc-/a/3084-31096.s?type=CoinArchives3084
HID02906262019
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Estimate: 200-300 USD