Good morning.. Real! The 1943 Cents were made of Zinc coated Steel Planchets. So it is normal. No Mint Mark was struck at the Philadelphia Mint Total Produced: 684,628,000
a 1943 penny was made from zinc coated steel that is why it stuck to the magnet they are fun to find and fun to collect
Watch out for those that are copper coated and sticks to a magnet. They are still real. But will get your heart a pumping fast. Lol