JAN-5W4 KENRAD "NOS", 5-pin, 5V. Made in USA
The 5W4 is a directly heated full wave rectifier with an oxide coated filament. The reservoir capacitor is given as 4 μF.
This Ken-Rad is also marked as a VT-97 indicating that it was a Type supplied to the American government. The Ken-Rad name on the steel case. The thin metal tube envelope is 25mm in diameter, and excluding the IO base pins is 70mm tall.