Compliments of Whisker:
Donald Hutslar listed a White Foster in Columbiana Co, OH, in 1868, picked + copied by Sellers
Whisker has a William Foster, born c.1809, in Mercer County, PA, based on 1850 US Census.
Sellers listed him in North Liberty, the hamlet in Mercer Co where he worked
He was also listed in Boyd's 1861 directory of whole state of PA
Either could be correct man -- could be another thus far unlisted person
no way ever to tell w/ only a barrel