The coin in question is a unique piece from the Patterns & Trial Coins series, minted in the United States of America at the Philadelphia Mint in 1866. This particular coin is distinguished as a proof $10 (Ten Dollars) denomination, crafted from copper, which is quite uncommon for this denomination during that period. Notably, this coin lacks a designer attribution, and there is no mint mark indicating its specific production line. It has the remarkable characteristic of having a mintage of zero, suggesting that it may have been a trial coin that never proceeded to mass production or circulation. While the specific weight, diameter, height, and width of the coin are not provided, the significance of its proof production type implies a high quality of craftsmanship typical of proof coins, characterized by their mirror-like surfaces and sharp detail, designed primarily for collectors. This 1866 trial coin exemplifies the historical experimentation in U.S. coinage and is an intriguing piece for numismatists, particularly those focused on rare trial pieces. Its estimated value would depend greatly on its condition and provenance, with such rare coins sometimes fetching considerable prices in the collector market.
| currency | USD |
| currency-amount | 10 |
| designer | N/A |
| diameter | 0 |
| edge-type | N/A |
| height | 0 |
| material | Copper |
| mint-mark | None |
| mintage | 0 |
| type | Coins |
| weight | 0 |
| width | 0 |
| year-display | 1866 |