This is the granddaddy of them all! Only a single overdate has been found in the IHC series. The 1888 OVD-001 is the most coveted of all Indian Cent varieties. Extraordinarily rare, it can command extensive premiums in even the lowest of grades. Overdates occur when a die’s date is repunched with a digit punch of another year.
These types of varieties occur relatively infrequently in US coinage history, but the mint continually refined its process to prevent overdates and repunched dates from occurring. In 1909, they began to punch the date directly into the master die.
Overdates of the Flying Eagle and Indian Head Cent Series
The 1888/7 Snow-2 – Is it an Overdate? by Dr. Tim Larson
Analysis of the 1888/7 Snow-2, Die Pair #2 Variety by Chris Pilliod