China
People's Republic silver Proof "Vault Protector" 5 Ounce Medal ND (1987), Cheng-pg. 48, 2. 70mm. Sold with original case of issue.
https://coins.ha.com/itm/china/china-people-s-republic-silver-proof-vault-protector-5-ounce-medal-nd-1987-/a/61165-97213.s?type=CoinArchives61165
HID02906262019
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Estimate: 300-400 USD