40mm numeric  tube manufactured by Siemens

The ZM1220 is a red coated numeric nixie tube manufactured by Siemens. It has a digit-height of 40mm and is very rare. Currently, i don't have any more information about the tube.
Brand / Manfacturer Siemens
Same Types
Likely Tyes
Symbol height in mm 40
Characters / Symbols 0-9
Decimal point none
Base / Socket B13B
Starting Voltage (typ) tested at 180V, 10kOhm V
Maintaining Voltage (typ) 0 V
Current per Segment 0mA
Reccomend Resistor 0