It looks like an old plough or cultivator. Its been there for years so no-one seems to mind it being there.

I was going to add an amusing caption along the lines of "This barrow seems to have suffered under the plough...." ha ha!

But I couldn't be arsed :0)

Phil
ps
This is one of the closest sites to where I live. The coast in the distance on the photo is the area around St. Merryn and Padstow.