The Fred McAdoo W7VQM WebSite
Technical Materiel Corp. GPR-90
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the hallicrafters SX-28
Stewart-Warner R-390A
Technical Materiel Corp. GPR-90
hallicrafters S-40A page

TMC GPR 90 receivers and associated accessories, made in New York and in Canada from mid-50s to mid-60s.  Very high quality construction, sold to governments and to amateurs.  Featured below is my Serial # 1948 made around 1957.
This is a general coverage radio receiver - 540khz to 31.5mhz in six bands.  It is dual conversion on the three upper bands.  It uses 15 tubes.  Has accurately calibrated main tuning dial and a bandspread dial calibrated for ham bands in use at the time the radio was built.
The radio weighs about 60 pounds.  More information on the Technical Materiel Corporation products may be found here: