Early in 1960 the U. S. Mint created a second master die for the cent having a taller, slightly oval 0 in the date and long-tailed 9 and 6. This reduced filling of the 0, which was a problem with the Small Date cents.
1960-D Large Date cents are very common, comprising the majority of Denver Mint cents for 1960. This variety is attributed automatically as part of the grading process and does not require a VarietyPlus fee.
NGC Population Report