There's no common term "black penny". I assume you mean English pennies* because U.S. cents from that time period are small coins, the same size as modern 1¢ coins.
Because you didn't give dates, the best I can do is point you to a website that lists current values for English coins. The prices are given in £ sterling; multiply by 2 for a rough conversion to U.S. $.
(*) The plural is pennies Words with apostrophes are not plurals, they're possessive nouns, so "Penny's" means something belonging to a woman named Penny.
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