You found Excalibur (aka the Cobra) then. 'Old rusty spear head'....

. An interesting bit of metalwork as it has been used as various boundary markers but I'm not sure anyone knows where it originally came from. When I first knew it (back when dinosaurs still roamed) it was in a boulder that eventually split though frost damage and Excalibur fell out. It was bedded into another boulder but then in 2014 it was stolen. It was broken off and to do so the boulder was dragged out of the ground. I have photos I took soon after. How and why............??????? It took some doing. Quad bikes and a winch at least I'd have thought. Excalibur was subsequently recast and mounted in the plinth you see now.