15.5mm numeric tube manufactured by RFT / WF

The Z560M is a red coated numerical nixie tube manufactured by WF/RFT. I has a dome top, that makes the digits look a bit magnified and give the tube an unique look, the coating covers only the top, most likely for cost saving production.
Brand / Manfacturer RFT / WF
Same Types
Likely Tyes
Symbol height in mm 15.5
Characters / Symbols 0-9
Decimal point none
Base / Socket B13B
Starting Voltage (typ) 170 V
Maintaining Voltage (typ) 135 V
Current per Segment 1.75mA
Reccomend Resistor 20kOhm = 1.75mA