The Waltham Watch Co. (WWCo) grade was introduced in 1867 apparently as a bridge between the high grade AT&Co and low grade HWCo movements. All WWCo movements were given 15 jewels, but not quite all of the features of the AT&Co grade (e.g., the jewel settings are fake, just engraved into the plate). It was provided with stem winding as illustrated by this exhibited watch even before the AT&Co grade, albeit not a very good one (probably because at the time the company was offering stem winds in higher grade models). This 1873 WWCo watch on exhibit is still key set. In fact the stem can be turned only clockwise. Note this SW movement, as with typical factory M57 SWs, is held with two case screws whereas KW/KS versions have only one screw. It is also equipped with a main spring let-down screw on barrel bridge, but is deactivated on the pillar plate side.
