12 STARS / 13 STARS ????

prooflike

I noticed for the 1828 half cent there is a 12 star variety and a 13 star variety... why the 12 stars, did the guys at the mint not count too well or what???

Numismanic

From the Heritage Coin archives:

<< <i>. A curious mint blunder; apparently the engraver absent-mindedly neglected to enter the final star, since there was space for it on the obverse die. >>