I wrote a short blog (here) about these manger balls / chogs a while ago.
They are variously known as chogs, sliders, manger balls, manger logs and tying up bobbins.
They were traditionally used to weight a rope that passed through a ring or slot in a manger and attached to the halter or headcollar, thus allowing the horse to move but preventing the rope from looping dangerously.
This example is turned from a single pice of heavy wood or lignum vitae
It has a good aged patina with a many scratches and gouges from use.
There is a split part way down one side of the bobbin, there is no movement along this split.
Dimensions : Height 3½" (9cm), Diameter 4¼" (11cm)
Weight 787g (1lb 11¾oz)
Ref : Bobbin6
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