Actually there are many bests. After 1900 the 16 size by American producers was a mature design when standards were also well established. Not any really great differences in design and materials. All had similar fine performance and durablity whether 17 jewel or 23. Less popular Howard, Hampden, Illinois, Rockford,South Bend, and others all compared well with the Big 3 Hamilton, Waltham, Elgin. Shown here are examples of the popular Bests. The Waltham has a nonconforming dial like a rr but with radium. It has original glass gone to purple from the radiation. The Elgin is their last U.S. made model as is the lady model. The Howard is rare with 17j. The Hamilton is their last U.S. 23j model.