How about a bar over a fire, for hanging cooking pot?
part of a barbecue ?
a gate latch
G clamp maybe
Is it a window or fanlight opener?
rotisserie ?
Vice
Heated trivet/plate?
is it a toilet seat bolt?
Knife sharpener
grill pan ?
A well!
appel peeler or corer
is it part of a wood burning stove?
Old kitchen appliance clamp or old window bracket.
Serrano ham holder.
That was a real pig!
I got that one rather quick when I saw it. My mouth was watering thinking of a half carved leg with flies and a dirty looking tea towel over it. I'm just up so will post something shortly.
Can't beat a nice bit of rust
although I will eat it in other places
Is it a mould?
Whetstone
She was about to sell her house at the time and the only advice the estate agent gave before viewing was "Remove that "thing" from the kitchen"