Sweden
Oscar I copper Proof Pattern 10 Ore ND (1853) PR63 Brown NGC, KM-PN86 (listed as 1854). A rare pattern struck during the proposed transition to decimal coinage featuring the head of Oscar I and value. Boldly-struck and attractively toned, with glossy, mahogany surfaces that present moments of coppery iridescence nestled within the legends. At present, this is the only certified example of this large denomination, making it absolutely intriguing and quite possibly unique.
Estimate: 1250-1750 USD