There is no size reference but I bet its not a Penny or Halfpenny, as they were proof only & very valuable. Its more likely a Farthing which are pretty common.It's a British halfpenny 1839. Low mintage, 268 800 examples. Not sure of the value.
Sorry for the lack of info of the coin, was away from home when I posted. Coin does measure 22mm, with some help of "Google", you and the measurement I believe you are correct that it's a farthing. Still pretty cool for a coinstar find in Pennsylvania. Thanks for the help...There is no size reference but I bet its not a Penny or Halfpenny, as they were proof only & very valuable. Its more likely a Farthing which are pretty common.