This is a Cunningham rolled lip jar mde in Pittsburgh.  It's not pontilled, but undoubtedly a very early jar.  The embossing on the base reads "Cunningham & Co/Pittsburgh".  This company changed its name several times over the years and there is a paper about it here:

http://www.blm.gov/historic_bottles/pdffiles/Cunningham_BLockhart.pdf

It's a bit confusing, though.  It claims that "Cunningham & Co) was used 1878-1891 and then in the same section claims that a jar marked "Cunningham & Co" was before 1857.  This jar seems way to early for 1878 so I think it would have to be 1857 or earlier.