Now there is an unusual watch. I have never seen a Tremont. The skinny.
https://pocketwatchdatabase.com/search/result/tremont-watch-co/2202
From Michael Harrolds book American Watchmaking, a Technical History of the American Watch Industry 1850-1930:
Aaron Denison put together the Tremont company as an attempt to avoid expensive American labour. Escapements balances gear trains and fine parts were made in Switzerland then mated with heavy brass and steel parts made in Boston. This was a successful business and the owners concluded to build the entire watch, moving to the Boston suburb of Melrose. The Melrose watch Company got out some watches but expenses rapidly overran financial resources and the operation closed. Tremont operated from 1864, to 1866. Melrose Watch Co. operated from 1866 until 1868.
According to the Shugart, Engel, and Gilbert 2014 edition, Tremont made about 5,000 watches. Truly a limited edition, this one. Is it me, or does this watch have earmarks of early Walthams? Note the Liverpool Windows”. Aquamarine? Rock crystal?