Without going into too much detail, I came across this at my usual local spot, The only thing within around 1 mile radius is a tower which was finished in 1848, there is a bit of history to this place in terms of pre WW1 army training but I believe it to be a door knob/plough collar/bed post knob. There is a firm but soft ball saped item inside which jiggles around, what do you think?
http://i46.tinypic.com/68927l.jpg
http://i45.tinypic.com/2zri5u1.jpg
http://i46.tinypic.com/68927l.jpg
http://i45.tinypic.com/2zri5u1.jpg