Other highlights include an exhibit of the pioneering automated machinery developed by the American Waltham Watch Company, allowing for the first time to mass-produce watches using interchangeable parts, a large selection of American pocket watches (including Railroad watches), and the "Engel Clock", a complicated "monument" clock built by Stephen Decatur Engel of Hazleton, Pennsylvania. This clock took Engel about 20 years to complete, and it was shown for many years all around the United States starting in about 1877.
Highlights also include an exhibit showcasing pioneering automated machinery created by the American Waltham Watch Company, which allowed for mass production of watches with interchangeable parts; a variety of American pocket watches (including Railroad watches); and "Engel Clock," a complex monument clock designed by Stephen Decatur Engel from Hazleton, Pennsylvania. This clock took about 20 years to build and was exhibited throughout the United States starting around 1877.