Looking for a Neon Bulb.
US Army Signal Corp PN 2z5888
Littelfuse # 5122
NSN 6240-00-223-9107
Its a telephone style bulb but a neon with NO RESISTOR. 
I found one on Ebay France but of course "No Ship-a-vouze to the USA"  
https://www.ebay.fr/itm/353484671304