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ID = 51325
United States of America (USA)
Brand: Burroughs Corporation; Plainfield (NJ)
Tube type:  Beam Switching Tube - incl. "Trochotron" 
Identical to BD-203
Predecessor Tubes 6700  

Base SPECIAL TUBEBASE in general
Filament Vf 6.3 Volts / Indirect

Beam Switching Tube with a 26 pin base. 1MHz counting frequency. This was the slim version of the unshielded external-magnet 6700. The glass bulb was shrinked above the base, just before entering into the magnet.
Operating principle of trochotron.

BD-203: Manufacturer's Literature
Emilio Ciardiello

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