The 20 cent coin was minted in the United States in 1875 and was briefly issued as a means to address the confusion between the dollar and the quarter. However, the coin was not popular and production was discontinued after only a few years. The mention of Hawaii in relation to collectible coins typically pertains to the specific state quarters released in 2008. The year 1891 and Philadelphia refer to minting locations and dates, but no 20 cent coins were minted in those contexts, as the 20 cent denomination was produced only in 1875 and 1876 in Philadelphia.