

The same scene as that on the present watch can be found on the chatelaine hook of a watch by Josiah Emery, No. 660, the case of which is hallmarked London 1774, and which also has an en grisaille scene of a neo-classical figure, both this and the scene to the hook are signed 'AT' for Augustin Toussaint. Emery no. 660 may be found in the Patek Philippe Museum, Geneva and the watch and chatelaine are illustrated in: Peter Friess, Patek Philippe Museum, The Emergence of the Portable Watch, Vol. IV, 2015, pp.490-491.
In Watchmakers and Clockmakers of the World [21st century edition, 2006, p.11], Brian Loomes notes that William Allam was based in London’s Bond Street and was a Freeman of the Clockmakers’ Company between 1743 and 1785. For a watch numbered 1416, that has a similar movement by Allam with ruby cylinder and a case also by Peter Mounier, see: Antiquarian Horology, No. 3, Vol. 29, March 2006, p. 340.