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The 0W4/350 is a full wave rectifier. The filament is an inverted V. The spots on the envelope suggest a mercury vapour device.
Thanks to Bob Hopkins for sending the image.
The classic envelope is  mm in diameter, and excluding the B4 base pins is  mm tall.
Reference: Observation.


Updated April 27, 2013.
shape:classic type:rectifier.fw base:b4 pins:4 pin:
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