18-size hollow-back going-barrel movement, the frame stamped with its Lancashire size as well as M.M (possibly Mathew Makin, Prescot), R.H (possibly Robert Harold, Prescot) and the finishers number 20988, the train in a separate pill box numbered as the frame, plus a separate barrel and dummy barrel in the tin. No escapement parts or dial. The frame 46.5 mm diameter.
I associate fullplate frames that were either fitted with a fusee or a dummy barrel with the watches sold by the Lancashire Watch Company, from which firm, given its number, this may well be a survivor. The tin also contains a hand written note: Dummy pivot was getting rusty, was turned out April 21st, 1902
All rough movement are rare survivors, this caliper even more so it bearing various stamps. In good clean but dull condition, the steel work with some light rust.