It's S/N 83523.
I haven't tried to power it up. I suspect it was at least attempted at some stage, because the power cord has been replaced with a 2-conductor molded plug and cable as commonly found on Japanese transistor radios etc. I plan to at least take a look inside and check for replaced components.
I powered mine up with a variac, low current fuse and current limiting resistor. Nothing glowed.
Over half the caps in mine showed visible signs of failure. Four had been replaced.
About 1/3rd of the carbon resistors were way over spec.
Half of the potentiometers were seized solid.
I am basically replacing everything inside except the valves and potentiometers.
I am not attempting to stuff the old caps with new versions. Too much work for zero return.