The Philco model 522 was manufactured for Chas Begg & Co. Ltd by Dominion Radio and Electrical Corporation Ltd in 1955.
Bakelite 5-valve all-wave mantle radio. Big brother to the model 502.
Valves (5): 7S7, 7B7, 6AV6, 6AQ5, 6X4
Intermediate Frequency: 455kc/s
Frequency Bands: 3
Chassis Notes(most schematics can be clicked to download a full size version)
Service information (Philco_-_model_502_and_522_-_5V_AW_AC_-_1955_.pdf) here