2006 20th Anniversary Gold Eagle Set NGC 70 W/Michael Castle Signature
Michael Castle – Genuine Signatures
2019 National Zoo Proof 1 Oz Silver Buffalo at the Castle NGC PF 70 Ultra Cameo! | eBay
2001-D US American Buffalo Commemorative BU Silver Dollar - NGC MS69 Castle Red
ANTIQUE 1830s DANIEL CASTLE SALISBURY COIN SILVER PAIR OF SPOONS BUFFALO NY | #1790322406
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2006-2020 PF70 Gold Buffalo Set | B.C. Bullion
2008-W Burnished American Gold Buffalo NGC MS70 4-pc Coin Set Mike Castle Signed
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Hobo Nickel Dracular's Castle Carved Shaun Hughes by shaun750 on DeviantArt | Hobo nickel, Coin art, Hobo
2019 Smithsonian Zoo 3-Coin Buffalo Set Gold + Silver Medal Scarce and Unique Coin Division NGC PF70 UC with Certificate of Authenticity Natanya Van Niekerk Signed Label - ModernCoinMart
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2006 American $50 Buffalo NGC PR70 W/Michael Castle Signature