In the early 1960s the “roll boom” in U.S. coins was exacerbated by speculation in 1950-D nickels (in particular), by the debut of Coin World in April 1960, and the sensation created that same year by the appearance of Small and Large Date variants of the 1960 Philadelphia and Denver Lincoln cents. After Coin World published the story, bank-wrapped $50 bags of 1960 Philadelphia Small Date rolls soared to more than $12,000