One for the hive mind.
Over here in Buxton we have a market a couple of days a week, where one of the traders sells various bric-a-brac.
Some I buy, some I try and help him identify, but this one has me stumped.
Not the best of photos as they were grab shots on my phone.
We know KLG were a spark plug maker, and this seems to tally with the ceramic material from which this is made.
It's about the same size as a spark plug, but with no metallic parts.
There is a through hole of about 3mm/1/8" as though a wire might pass through to some sort of (absent) metallic cap.
The box is plain, with no lettering of pictures, and seems original.
Front View

Side View

The longest end is forked
Any Thoughts please
Bill