Apparently: '‘This movement was made by A Michel SA of Grenchen. The date of founding is not known. The earliest document seems to be a patent taken out in 1916 for a winding mechanism. In 1925 A Michel SA joined Ébauches SA, an association of 26 ébauche makers, including Fontainemelon, A. Schild, ETA (at the time the movement division of Eterna), and a number of other Swiss ébauche makers.’ Information from http://www.vintagewatchstraps.com/movements.php Trench Watch apparently A Michel Cal 220 manually wound movement, working fine keeping good time. Enamel white dial with yellow Arabic indexes with matching cathedral hands, sub seconds. 0,925 silver cushion case, and case back, movement with words ‘Swiss Made’ Fixed lugs Measurements Diameter excluding winding crown: 34 mm Length including lugs: 40 mm Depth to centre of crystal: 9 mm Lug gauge/strap width: 22 mm Comes with a blue and white new NATO strap Ships by registered mail with tracking (in 3–5 days)