Unknown. No maker of stream markers has been determined.
Marker had been broken years ago and was mounted to a pipe with U-Bolts. Restored 2015 by KMT. Original post provided by KMT from another location where marker was irretrievably lost.
2011 photo by G. Sassaman shows marker missing bottom section
2013 photo by J. Graham shows marker with bottom section replaced
June 2015 photo of repaired/repainted marker by J. Graham
PA Route 204 at Penn’s Creek Bridge
Typical double-sided stream marker on top-mount post