Probably not. Still, literary convention might miss the fun of hitting the double posessive.
Probably though this is why many of us tend to describe the old companies sans apostrophy-"s", leaving us with a Carter fountain pen. Makes things bit easier when possessive form is required.
Carter made pens only a few years (it seems) and catalogue data is limited. Yet the pens are high quality and are highly sought, the relatively small collector base keeping prices for the scarce pens at least on par with similar items by the Big-5.
The pens described by many as "snakeskin" pattern seems to be more of a pearlescent mosaic. The geometry of the black lines is rectangular. But variation within the pearlescent plastic further enhances appearance.
These are uncatalogued, at least so far. They are quite scarce and hold significant cachet to Carter collectors.
At this point after about twelve years collection, I've managed to score four.
I'm aware of two styles: one with rounded end pieces and tassies, the other with less rounded end pieces sans tassies.
Just some eye candy