Im new to the forums and coin collecting altogether. Any advice would be nice. The "error" I saw was on the backside of the coin, where the "cents" in "five sents" is almost entirely wiped out.
Probably a grease filled die. Wear wouldn't selectively remove the word and leave all the others around is so much less worn.
Given the overall look of the coin, on both sides, it's difficult to tell if it's wear/damage, or a filled die. I'm leaning towards damage,as part of the wear pattern and look of the coin. The missing area looks rougher than it should for a filled die, imo.