I found a few cool misprinted minitron style 7 segment incandescent displays. Essentially, they are numitrons that are in a flat pack. As best I can tell, they were primarily used in the aviation industry because of their dependability and durability. I’ll take some more photos of them in use after I figure out their pin out. Stay tuned.
The Large Ones:
- Box markings: RS Stock No. 586-863 7 segment filament display.
- Unit Markings: L080705 3015-F
The Small Ones
- Unit Markings: KW-104SAU-8P & 8649, 8611, 8636, 8705
Lore more here: http://www.leftfield.org/~dd/minitron.html