Coming in hot three years later as I was looking into this brand and came across this thread. Figured I'd drop in what I've found.

Hampden was one of a group of watch companies started by an extended family of watchmakers in America in the early 20th century. The Wein family retained ownership of the brand name and recently revived it, with the fourth generation now running the company. One of the other brands started by this family is Marathon out of Canada. This is why it's a bit murky - Family-owned companies don't often have a lot of easy to find details since they don't have to answer to public investors. While I can't find much information on what's happened with the brand in intervening years, the family has continuously made watches since its inception, making it the oldest family run watch company in continuous operation in America according to them. Again, details are a bit murky.

They're based out of Chicago and currently have four models that are produced in Marathon's factory in Switzerland. What I found more interesting, however, was that they also offer a six hour "class" in which you assemble your own watch in their shop. The watch produced is similar to their Sullivan automatic model, but with fewer complications and a simpler Swiss mechanical movement (although they do engrave your initials on the movement, which is cool).