It is VERY unlikely that you found a real 1943 copper penny.
From wish.com for 1$……..
All coin dealers get calls about the 1943 copper penny. Lots of fakes are still in circulation and in collections. Once a year or so, a radio station gets people excited about finding this penny. The internet promises that it is worth big dollars. However, it is VERY unlikely that you have one.
The 1943 copper alloy cent is one of the most idealized and sought-after items in American numismatics. Nearly all circulating pennies at that time were struck in zinc coated steel because copper and nickel were needed for the war. Approximately forty 1943 copper alloy cents are known to be in existence. Coin experts speculate that they were struck by accident when copper alloy 1 cent blanks remained in the press hopper when production began on the new steel pennies.
Because of the copper cent’s collector value, counterfeiters will coat steel cents with copper or alter the dates of 1945, 1948, and 1949 pennies.
The easiest way to determine if a 1943 cent is made of steel and not copper is to use a magnet. If the penny sticks to the magnet, it is not copper. If it does not stick, the coin might be copper and should be authenticated by an expert. It will need to be graded / confirmed authentic by NGC or PCGS to be worth anything more than a few cents.