A few months ago I saw this pocket watch with a pretty and unusually shaped bridge. I had never seen one before, and then another one pops up. They both have similarly shaped bridges but they are not identical. Both are marked Huguenin Vuillemin Locle (Switzerland). Only the one on the right has a serial number.

Both have plain Roman numeral enamel dials.

Is there any collector knowledgeable about this watchmaker/company to offer some information about them?