Vintage Bradley 2 Inch Ball Hitch Pat No 765874.
Not marked Bradley, this cast item is a two inch ball hitch, not 50 mm, suitable for a vintage two inch ball hitch. It has the 'Doublelock' name cast into its side, and the patent number on the other side.
The spring is strong, and needs a good pull to unlock it, the body being undamaged. The cotter pin may have been replaced, the thumb piece maybe bent, and the main bolt is decidedly a modern replacement.
Cash on collection from 3 miles of junction 23 or 24 of the M5 Motorway, in Bridgwater, is welcome, or I shall post with Hermes couriers, signed for and insured.