I would have to say $200 minimum for that coin.
Not based on completed sales on eBay. One just closed last night that was graded by PCGS that would be the equivalent grade of MasterMind's find for $104. It is a heck of a find, but it isn't the rare 12 star variety.
NGC list AU50 at $180 currently and $198 in AU53: Classic Head Half Cents 1828 AU 50 Brown Price History & Charts | NGC Coin Price Guide