The Space In Between - Thanks to Thomas Alva Edison!
This is the upper part of a light bulb.
Exactly: a Philips 12929B2 (12V, 4W).
It's used for a VW Lupo parking light. The height of the whole light bulb is round about 0,8 inch. I've connected it to a transformer (1,7V - 12V) of a model railroad to regulate the brightness of the tungsten wire.
Oh i love such small technical electrical tasks! :o)