There are many instances throughout the Indian Cent series where different digit punches were used in a single year. In other years, such as 1880, the digit punch fracture and deteriorate as it was being used to strike the dies. These instances where there is a variation in the date due to a digit punch, the variety will be assigned with a PUN number. To see a list of all PUN varieties, click here!
You can learn more at Wexler’s page on digit punches.