It’s is a mint error but it’s a common one. The I is not 100% present because the die was filled with grease. It’s only worth a few dollars at best.
Yeah. Probably a "grease filled error". It's so worn that it could be part of the absence of the "I". Not worth your time if you're going to look to sell. Not much interest in that sort of thing unless very dramatic. IMO.
Like they said, it's a grease filled die error. It's important to note that how an error or variety happened, affects it's rarity, desirability and value. Most of the time when letters are missing it's cause by a grease filled die, which is a rather common occurrence. But, for example, in the case of the 1982 no mintmark dime, the mint forgot to punch the mintmark onto one of the dies (mintmarks were manually added to U.S. coin dies up until 1990). This means that the only 1982 no mintmark dimes were struck by that particular die.
