Coordinates 40.004864, -75.264251 are for center of town. These are relatively new signs; one is located at each end of the Borough.
Maker undetermined - they are cast iron.
Painted in the red and gold colors associated with the Pennsylvania Railroad, four of these signs were made for and installed by the Borough about 2010. Narberth is a town on the "Main Line" of the railroad west from Philadelphia.
Although the typical keystone shape, this marker has a different text format than the more common town name markers. It is unknown whether these signs replicate similar ones that were there in earlier times. One remaining "old" sign is not a Keystone Marker.
Jan. 2020 photo by E. Harman
Earlier version of a cast iron sign at the Boro. Jan 2020 photo by E. Harman
Unusual use of the Keystone.
One of these is at Montgomery Ave. and N. Wynnewood Ave. Another one is at East Wynnewood Road and N. Wynnewood Ave. There are two others at edges of the Borough.