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2021 American Gold Buffalo 1 oz $50 - NGC MS70 Early Releases Castle Signed [21-BUFF-N-MS70-ER-MC-NSL] - Liberty Coin
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2019 SMITHSONIAN SILVER Buffalo at the Castle 1 Oz. - Etsy
2019 National Zoo Commemorative - Buffalo at The Castle - Smithsonian Institution Private Issue Silver Coin (NGC PF70 Ultra Cameo) | Pristine Auction
2006-2021 PF70 Gold Buffalo Set | B.C. Bullion
2006-W $50 One-Ounce Gold Buffalo, Mike Castle Signature, PR70 | Lot #93123 | Heritage Auctions
American Buffalo Gold - A Reintroduction - Currency and Coin
Roll of 20 - 2023 1 oz Gold American Buffalo $50 Coin BU (Lot, Tube of 20)
BNP Challenge Coin - Buffalo Naval Park
2022 American Gold Buffalo & Eagle set NGC MS70 FDOI Michael Castle Signatures
The Coin Vault
2006-2021 PF70 Gold Buffalo Set | B.C. Bullion
2019 Smithsonian Zoo Buffalo 1 oz Silver Medal NGC GEM Proof
Buy 2014 1 oz Gold Buffalo MS-70 NGC (Mike Castle) | APMEX
2019 W GOLD PROOF CASTLE SIGNED $50 BUFFALO 1 OZ COIN NGC PF 70 UC EARLY RELEASE | eBay
2019 W GOLD PROOF CASTLE SIGNED $50 BUFFALO 1 OZ COIN NGC PF 70 UC EARLY RELEASE | eBay
2022-W $50 Proof American Buffalo Gold Coin Released | CoinNews
