It's not on the list of US makers.
I was looking up a steel pen marked "Shirley's" from Indianapolis, and found this as well.
I started digging.
Turns out in 1891 James A. Allison was a jeweler in Indianapolis
In 1892 he decides to add Paul Wirt fountain pens to his merchandise.
Perhaps he realized that he could probably make these himself, and by the next year, he's advertising his own pens.
By 1899, it's just fountain pens and fountain pen repair.
In 1912 he's still making pens and repairing them.
By 1916 he's no longer advertising, but he's still listed as making pens in 1922. Unfortunately, there's a gap in the directories. I haven't nailed down when he stopped making pens, but hope to soon.
Now I'm curious if anyone has seen one of these or knows what they look like. I suspect it was a local pen made for the local market, and probably why it was not in the list. But he did make fountain pens for at least 30 years. I would have thought something would have survived. I'll reach out to the Indiana historical society and see what they may have.
In the meantime, I thought I'd share.