This is a top-mount marker of the type placed at state-affiliated colleges and other state institutions. (See Thiel College and West Chester Univ.)
This particular one is an aluminum replacement, made by Lakeshore Industries of Erie PA. It is mounted on the cast iron post that once held the original cast iron marker.
A second identical markers stands at King St. and S. Fayette St. This second one is on a round aluminum post.