Not to be confused with the Waterman model of the same name, X-Pens is a relatively new and slightly mysterious producer of pens, which seems to aimed to appeal to a popular market. They seem at some pains to disguise their exact location, but the fountain pen community is comfortably certain that a lot of parts come from Chinese makers. This is neither here nor there, as most fountain pens are made there now anyway. Looking at X-Pens’s website, one finds that they make primarily metal-bodied pens.
Models I’ve examined: