That makes it about 75+ years old. By the end of WW2 they only had 18 units. The end of the steam era on the PRR was around 1964 - 1965. I have just begun to list similar sets from a collector's hoard dating from the 1920's.
Rare Antique PRR Pennsylvania Railroad RR Signal Lamp Lantern Co NY Hanging
Antique Rare Adams & Westlake Pennsylvania Railroad RR PRR Oil Lantern PA USA
VTG Handlan Oil Lantern Pennsylvania Railroad RR Etched PRR Keystone K Globe USA
1950 PENNSYLVANIA RAILROAD RR Advertising Passenger Train TIMETABLE Map Schedule
1949 PENNSYLVANIA RAILROAD RR Advertising Passenger Train TIMETABLE Map Schedule
50s PENNSYLVANIA RAILROAD RR Advertising Train TIMETABLE Map Schedule Passes