15.5mm symbol tube manufactured by National Electronics

The NL-884 is inverted clear glass side-view nixie tubes manufactured by National Electronics. It can display the plus and minus sign. It is very interesting that this tube is made and sold as "inverte" (hanging) tube, even when it does not make any difference if the plus or minus is inverte. It would look exactly the same if a standrt plus and minus tube would be inserted in haning position
Brand / Manfacturer National Electronics
Same Types
Likely Tyes
Symbol height in mm 15.5
Characters / Symbols +,-
Decimal point none
Base / Socket RTS-14
Starting Voltage (typ) 170 V
Maintaining Voltage (typ)  V
Current per Segment 1.5mAmA
Reccomend Resistor 8.2kOhm @ 170V, 43kOhm @ 250V, 62kOhm @ 300V