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 piece of heavy wood or lignum vitae
It has a good aged patina with a few scratches and markss from use.
Dimensions : Height 3¼" (8.5cm), Diameter 3½" (9cm)
Weight 380g (13½oz)
Ref : Bobbin007
email or phone 01373 831464 for further details
Price :
£34.00 (+ £4.85 insured shipping within UK which should take 24-48 hours),
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Although antique it may be subject to VAT / customs in some EU countries