I was walking on the beach when I found an odd lump of something with a few
wires dangling out of it and in the way that you do, I bashed it with a rock
to see what was inside. ;-)

Eventually I dug this out.
http://www.zen31010.zen.co.uk/images/mystery_object.jpg

It's about 6 x 4 cm and about 5mm thick. It's definitely NOT a mechanical
component and I think it's perhaps from the base of a radio aerial, probably
off a boat. I think originally there would have been a conductor threaded
through the "S".

Can anyone confirm this (just for curiosity's sake)?

Tim