There is a law but there have been plenty of exceptions including President Calvin Coolidge on a 1926 half-dollar and Alabama Governor Thomas Kilby on a 1921 co

There is a law but there have been plenty of exceptions including President Calvin Coolidge on a 1926 half-dollar and Alabama Governor Thomas Kilby on a 1921 commemorative coin and Carter Glass on the 1936 Lynchburg Half Dollar.