15.5mm symbol tube manufactured by JAN

This unknown symbolic and-view nixie tube manufactured by JAN, can display various letters and the plus and minus sign. It is very interesting that the letter f is not a capital letter compared to the other letters. On the tubes the following type number fragments can be found "294252" and "88781" If you have more information about this tube, i would be very happy to hear it.
Same Types
Likely Tyes
Symbol height (mm)15.5
Decimal pointnone
Starting Voltage (typ)170 V
Maintaining Voltage (typ)0 V
Current per Segment0mA
Reccomend Resistortested at 10kOhm