Popular domestic product with good quality USR-300B
This is a domestically produced 300B made to the same specifications as those made by Western. A filament suspended from rice ball-shaped mica.
There are plenty of getters, and it is in the original box from that time.
The original box appears to be NOS, but since it is unknown, it will be listed as a used item. Overall, there is plenty of getter and there is no burnt and it is clean.
The box is a little worn, but seems to be fairly sturdy.
The price is for 2 pieces.