10.5mm symbol tube manufactured by Unknown

The Z5710M is red coated nixie. The manufacturer of this tube is unknown, but could be RFT/WF. It can display a plus- and minus-sign and a sinewave symbol as well.
Brand / Manfacturer Unknown
Same Types
Likely Tyes
Symbol height in mm 10.5
Characters / Symbols +,-,sinewave
Decimal point none
Base / Socket 0
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 140 V
Current per Segment 2mA
Reccomend Resistor 15kOhm = 2mA