1934 Philadelphia-minted pennies are very common coins in all circulated grades and in all color designations through MS66. They become scarce in MS67 and rare in higher grades. By the mid 1930s, the invention of the penny board helped increase the number of coin collectors throughout the United States and encouraged the assemblage of Lincoln cent collections by date and mintmark. Thus more and more people were saving Lincoln cents by the mid 1930s, and this is reflected in the significant number of high-end Lincoln cents known today dating after 1933.