This movement is not exactly a forerunner of the Model 57 because it has a different train arrangement in which the 4th, 3rd, and center wheels are stacked above one and another, and the center wheel, which is solid, is buried in the pillar plate. Probably to simplify the manufacture of the pillar plate, the train was rearranged to raise the wheels in later movements. There is evidence to believe that the first few hundred movements were made (or at least began) in the Roxbury plant with the earlier layout. This example DH&D movement is fitted with 15 jewels, has jewel settings on the top plate and is undersprung with a solid steel balance. The porcelain dial is plain with Roman numerals and the seconds bit is not sunk. The silver hunting case is marked F.M 4580.
