The original Buffalo nickel design had an impressive raised relief engraving, most prominently in the ground on which the buffalo stands. But after the acclaimed release in 1913, banks complained about stacking problems. So the design was revised that same year. The raised mound was replaced with a simple flat line creating Type II nickels. Only about 3% of this revised design were produced in 1913, the first year of issue. And fewer than 4% of those were S-mint specimens output in San Francisco. Well traveled Good quality.