I picked this bulb up from the Little Shop o'Mathoms, partly as an electrical curio and partly to amuse a friend with Masonic connections.
The Masonic symbol is the usual square and compass. Being American, it also includes a large G, standing for Great Architect.
These novelty neon bulbs are more common in the USA. Neons need around 90V to strike, which is compatible with US supply voltages of 110V. Although the UK had a wide range of supply voltages at this time, most were over 200V.
Naturally I needed to test that it worked, so I fitted a suitable bulb holder to an old GPO bellset ringer 26 (in its rather lovely art deco case). These generators produce a nominal 75V output, so the neon tends to flash and fire rather unevenly - it's rather cute though.
The original box is a little tattered, but still legible.
I've since acquired some Indian-made neon bulbs; Ganesh, Lakshmi, an Om and even a Swastika.
Photos when I have the chance