Yup. Altered S-187. You can see where they wore away the massive obverse die break. The die breaks and strike weakness on the reverse also match up. This alteration was expertly done, but not quite good enough. Since the die break between the 0 and A on the reverse was not a characteristic of S-189 (1799), I looked for a match among the 1798s. Turns out it was the first one I checked.
The eyehole in the 2nd 9 is too small. But I would have been fooled. It's just a guess but when I looked at a 1799 the holes in the 9 were both the same size. And when I looked at a 1798 the hole in the 8 was smaller than the 9.
So obviously the 1799 is more valuable than the 1798, and probably a lot or they wouldn't have bothered to do this. What's the value difference? I don't know large cents.
I don't like it. It purports to be an an S-189 Normal date. Yet, there are some anomalies on the reverse, specifically, and you have to look closely, on some of the berries right and left at the top of the wreath. Here is the reverse of S-189: HA Archives. Look and compare at the berry above O(N), and right of (N)T. I see some differences. (Either that, or jet-lag after an 11 hours flight across the ocean and a 3 hour drive across Florida has got me cross-wired....).
I thought just by the appearance, not having looked at Sheldon numbers, that the second 9 was "off." The coin is in a lot of large cents and half cents on eBay, listed as a 1798 in the title with no other information. I'm guessing the seller listed it as a 1798 because he knew it was altered, and either 1. Didn't want it removed by eBay. And or 2. Hope's that buyers assume he made a listing mistake and he'll score big time.
As soon as I looked at the reverse I saw the "drooping" berry left and above the O in ONE. 1798 S-187 is the only rev from this hub that has that. (about half of the 1798's and all the 99's and 1800's used the same reverse hub, but they didn't have enough power to bring it up completely and the often had to add the berries and/or stems by hand. S-187 is the only one that has the berry going down like that. Once I saw that I saw on the obverse the arc die crack from the rim through T the base of Y and finally to the rim around 3:00.