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The original name of the company, which began operations in 1851, is unclear.
Some sources say the name was the "American Horologe Company".
With financial backing from Samuel Curtis, of small-arms manufacturing fame, the watch production began in 1851, and the first small group of watches were finished in late 1852.
Their revolutionary business plan was to manufacture the movement parts of watches so precisely that they would become fully interchangeable.
Based upon the experience of earlier failed trials, Howard and Dennison eventually perfected and patented their precision watch making machines, creating what has been called the American System of Watch Manufacturing.
Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.
There are several ways to get an idea of when your watch was made.