The 1983 copper Lincoln penny is extremely rare and valuable — because all 1983 cents were supposed to be made of zinc, not copper.
So, if you have a genuine 1983 copper cent, it could be worth thousands of dollars.

Date: 1983
Mint: Philadelphia or Denver
Normal Composition: 97.5% zinc, 2.5% copper (copper-plated zinc)
Rare Composition: 95% copper, 5% zinc (accidental leftover planchet)
Weight of Copper Penny: 3.11 grams
Weight of Zinc Penny: 2.5 grams

In 1982, the U.S. Mint switched from copper to zinc planchets to save money.
A few copper planchets were accidentally used in 1983, creating off-metal transitional errors.

Grade Value
Circulated $5,000–$10,000+
Mint State $15,000–$25,000+
Highest certified Over $30,000