Fullplate fusee movement with Egyptian pillars, typically well finished and engraved, the pillar-plate with stamped serial number and the balance cock not disfigured by the usual later changes to the banking. Verge (recoil) escapement. Nicely turned steel balance with original 2-turn balance-spring, as first developed by Tompion and arguably his single most important horological contribution in an illustrious career, the stud with a square pin fitting the square hole, a typical sign of Tompion’s quality of manufacture. 41.5 mm diameter, 18 mm deep, not including dial or centre arbor.
Though now synonymous with clocks, Thomas Tompion, at the ‘Dial and Three Crowns’ Fleet Street, London, was truly the ‘father of English watchmaking’ having been directly involved from the very beginning with the introduction of the balance-spring – see the book by Martin Ball. Tompion’s work gave English watches, more particularly ‘London’ watches, a second-to-none reputation that was to last for over 200 years, from which he became both famous and rich. It should come as no surprise, therefore, that his portrait shows him with a watch rather than a clock – see also the books by R W Symonds and the recent works by Jeremy Evans. NB: Dating from the short lived partnership of Thomas Tompion & Edward Banger, this movement is from the period that many believe saw the best of Tompion’s output.
Lacking dial and hands, but retaining the motion work, and with a brass-edge that although heavily altered (for later sedan clock use) may well be the original. If so, the SW stamp has not been previously seen on the brass-edge used on Tompion’s watches I believe – See Evans 300 years…. Otherwise complete and in good original condition, unlike most Tompion movements that infrequently come onto the market. Not cleaned by me but will just about tick when wound.