Half-plate fusee movement, the 16-size hollow-back frame stamped J.W (John Wycherley). Spring-detent escapement with broken detent, the roller complete with both its unlocking and impulse jewels. Compensation balance, 7-turn blued-steel helical balance-spring. 45 mm diameter.
Joseph Sewill, Liverpool, a famous chronometer and watch retailing firm.
John Wycherley, one of the best and most famous Liverpool watch rough movement manufacturers, supplier to most of the best English finishers of his day.
Lacking dial, hands and motion work, the detent broken and only the foot present. Not, of course, working, but an ideal project should anyone care to undertake the task of learning detent making. Otherwise worth the price for the helical spring and the rollers alone.