many moons ago I did have a Bartlett, this summer I saw one for sale that didn't look anything like the one I had. So I did the search, every thing ( pic's) looked more modern.
I think it's needle bar has a list of who made what.
Smithsonian says this ....
Bartlett Sewing Machine Company
New York, New York 1870-1876
1866-1870: Goodspeed & Wyman, Wichendon, Massachusetts
The Bartlett Sewing Machine Company featured pictures of sewing machines powered by
hand and foot.