This coin is certified and graded by ICG. This specific coin is a pattern die, meaning it was a test strike not intended for general circulation. It Was struck on an existing Argentina 10 Centavos coin (Km#26). The coin has an unfinished date "18xx" It is graded MS66 (Mint State 66) Due to its nature as a pattern overstrike, this is considered a significant numismatic rarity. $425