Nixie tubes, a special form of vacuum tubes formerly used as numerical indicators
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The electronic-parts are divided into 3 round pcbs: in the bottom the microcontroller with voltage-regulator, in the middle the nixies with her driver (74141), and on the top the high-voltage-generator.
Nixie tube drive of 240v is generated by a trigger coil running from a 1.5v AA battery.
I think it's a replacement tube for ZM1000 nixies, the tube is placed on a piece of printed circuit board which has pins soldered onto it which match the pinout of the ZM1000.
Nixie tubes (see above) were a common form of numeric display for electronic equipment from the mid-1950's thru the early 1970's, when they were supplanted by 7-segment LED displays.
The only real flaw in a Nixie display is due to the fact that the digits are stacked in front of each other, and therefore all but the frontmost digit will exhibit tiny gaps where they are shadowed by the digits in front of it.
I still haven't decided whether to use these for Nixie Clocks, placing the tubes where the meter currently is, or to use the meter as-is for an analog display similar to the WPS Model 13 Clock.
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