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.
Brand / Manfacturer JAN
Same Types
Likely Tyes
Symbol height in mm 15.5
Characters / Symbols +,-,A,D,f,G,H,L,W,R
Decimal point none
Base / Socket 0
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 0 V
Current per Segment 0mA
Reccomend Resistor tested at 10kOhm