Specific location undetermined
Believed to be on the Fulton/Franklin Co. line just east of McConnellsburg
Known from the photo below, but these wooden, not iron, large keystones were fixtures of almost all the highway summits across the ridges of central Pennsylvania.
Date unknown photo found on Ebay in 2019 by jtg. Shows the restaurant/rest-stops that were on most ridge summits. Keystone marker sign in left mid-ground.
Date Unknown photo found on Ebay 2029 by jgl
Along Lincoln Highway (U.S. Rt. 30) .
Believed to be on the Fulton / Franlin Counties border.