THE PIECE IS CONCAVE TO FIT THE SHAPE OF A HAT. ITS A REALLY HEAVY DUTY PIECE.
1947 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA
1952 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA
1941 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA
1951 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA
1948 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA
1946 PTC PHILADELPHIA TRANSPORTATION COMPANY ANNUAL REPORT TROLLEY BUS SUBWAY PA