I've recently discovered (under a ceiling that I took off) and old wall-mounted lamp. It has a curious lightbulb which I failed to identify so far. The lightbulb works right now (gives a beautiful "retro" glow), but should it ever die, I'd like to know if there's an option for a replacement. The issue is that the bulb is very short - around 15 mm - to fit the small housing of the lamp.
The lightbulb is 5W, has an E27 thread. Location is Netherlands (230 V).
I would appreciate help with identifying this lightbulb - or information on similar bulb types that would fit the housing - so that I can search for replacement options.


