IN-1 (No Base)

18mm numeric tube manufactured by Reflector/Sovtek

This tube looks like a IN-1 without the big brown base. This tube was either made for soldering into a board, but its more likely that this is a part of an IN-1. Maybe this part of the tube was manufactured and then assembled into a IN-1 by adding the base. It has no markings or anything else on the glass, but because of its shape it clearly can be identified as "IN-1". There is also a version with a fine grid.
Same Types
Likely Tyes
Symbol height (mm)18
Decimal pointnone
Starting Voltage (typ)170 V
Maintaining Voltage (typ)135 V
Current per Segment3mA
Reccomend Resistor12.6kOhm = 2.8mA