It was standard issue for the ws58 kit. It fit inside the vibrator power unit. That is the box above the radio. This box also held spare valves, etc for the radio. It was powered by two Willard wetcells that sat in the bottom of the case.
It is covered in the WS58 EMER. These were used a fair bit because of the battery supply issue.
This item is only the psu and probably isn't much use on it's own. The seller also said it had been modified. The complete VPU does appear for sale occasionally. I still have two myself to complete a pair of 58 set kits.
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