It looks like a bulb used in an electric fire with "coals". In such fires, the bulb was placed on it's side under a spinner vane which, when the bulb was hot, rotated to give a flickering flame effect.
The fires were called flame effect electric fires. They were very popular in the mid 1950s to late 1960s.
...... ..... Sorry about that. I hadn't seen the posts since the flash bulb was solved. My iPad had given me problems. It couldn't open apps. It went into a loop when I tried to turn off the power. Al is up and running, but it looks like I need to get up to speed with the forum threads!
Sent from my iPad 1 using iPF - Greetings