ANACS blew it on this coin . . . https://www.ebay.com/itm/1842-O-Sea...h=item23b0ba498f:g:hosAAOSws99cBYjF:rk:2:pf:0 . . . it's not the small date they attributed it as.
I think eBay automatically redirected from the OP coin (whose listing has been ended) to the SEGS coin. The SEGS coin appears to be small date, but the ANACS coin is large date.
Yes, you missed something, as pointed out by @NSP . Thanks to eBay's attempts to push alternatives on people, this sort of confusion occurs all too frequently.