PENNSYLVANIA STAE POLICE (on front of Base)
UC   E(on the inside of Base)
The shape of this piece does not have the characteristics of a true doorstop.
It was probably made for a select interest group, the Pennsyvania state police.
Another oberservation is the markings looks like modern style lettering.
This piece is shown for reference solely because:
it is shown in John Smith's Doorstop Book, stated value $500-700.
One sold July, 2017 on Ebay for $137, not a premium doorstop price.