15.5mm numeric tube manufactured by ITT

The GN-4A is a clear glassnumeric nixie tube manufactured by ITT. Its relatively compact and round shaped. There are a few other GN-4A models manufactured by different comapnies.
Brand / Manfacturer ITT
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)  V
Current per Segment 2mA
Reccomend Resistor 15kOhm @ 170V, 56kOhm @ 250V, 82kOhm @ 300V according to datasheet.