Somehow or another you know I'll cough that up with a little bit of prompting
(thanks for the compliments by the way).
This is an 1872 model Waltham. The design came out of the Nashua department-it shared a lot in common with the 1868 model, but both the winding and setting mechanism were improved considerably and the overall design improved.
Initially, the 1872 model was made in two grades "Am'n" and "Park Road." The Am'n was the better of the two grades. Incidentally, I was photographing all my '72 Am'ns last night. This was the 165th 1872 model Waltham made(the winding wheels are incorrect).
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Waltham continued to really improve the 1872 model, and by 1876 had released the superb American Watch Company grade(I do not have one of these). 20 of these were sent to the observatory trials at the 1876 Centennial exposition, with one bringing home the gold medal, at least a dozen others bringing home silver, and all placing exceptionally well. They were competing with the best that England and Switzerland could offer at the time.
Incidentally, around that same time the president of Patek Phillippe visited the Waltham factory where he was given an example of the 1872 American Watch Company grade. At his insistence, he simply picked one off the end of the assembly line. He took it back to Switzerland, where his chief adjuster examined the watch and reported that it was of a quality that Patek could only manage to produce in roughly 1 out of every 10,000 watches.
All that aside, the Am'n grade remained the second in quality to the American Watch company grade. All were 16j with gold settings, while American Watch Company grade watches usually were 21j and with supreme finish quality.