Fullplate hollow-back frame with incomplete maker’s stamp, the patent fusee with additional square for letting down. Single-roller detached lever escapement with Young’s patent safety action. Compensation balance, spiral balance-spring. 41 mm diameter.
James Young, Knaresborough, Yorkshire, Patent No 573, March 1858 (three parts): 1 – An arrangement for permitting a wheel or other part of the mechanism of chronometers, watches and clocks to be taken out by locking the fusee… 2 – The standard safety pin in the lever is replaced with a double-curved safety piece in order to prevent accidental locking of the lever.
NB: Young showed these “improved lever watches” at London’s 1862 International Exhibition and this movement features in a Letter to the Editor by Alec Marsden published in Antiquarian Horology, Autumn 1989, page 317.
Lacking dial, hands and the ratchet wheel apparatus used to lock the fusee. Otherwise complete and looking to be unbroken but rather dirty, the fusee chain present but detached. I have, however, seen only one other example (no 4209), an incomplete movement also lacking its lever. This example, being so rare, is certainly worthy of restoration and further investigation.