FYI - The general view is that 1942 brass planchets got stuck in the large hoppers used to move planchets around at all three mints. As zinc coated steel planchets were poured in and the hoppers moved about, the brass leftovers dislodged and got struck as 1943 brass cents. However, in San Francisco the need for workers was so great that high school boys were hired during summer break. One of the boys claimed that he and others tossed some brass planchets they found into the hoppers "just for fun." This is the only instance where there is any indication of deliberate, though unofficial, actions.