Stack's Bowers & Ponterio
May 2020 Hong Kong Auction - Online 7 May 2020
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CHINA. Silver 5 Yuan Proofs (5 Pieces), 1994. Inventions & Discoveries Series. All NGC PROOF-68 Ultra Cameo.
1) KM-627. Recording of Comets.
1) KM-627. Recording of Comets.
2) KM-628. Tuned Bells.
3) KM-629. Silken Fabric.
4) KM-630. Chain Water Pumps.
5) KM-631. Sailing Masts.
Estimate: $200.00- $300.00