During World War II, the U.S. Mint switched to zinc-coated steel pennies to conserve copper for military use. However, a small number of 1943 pennies were mistakenly struck in copper ...

Re “So long, penny! Trump orders U.S. to ditch 1-cent coin after decades of complaints” (Feb. 10): Consider this solution to the penny problem. In 1943, copper became so dear that to support ...