Vintage nibs?!? Who'd want vintage nibs.
Actually, oh my. If some No. 1 American Business College nibs get you going, then I'm afraid you've got the bug.
I'd have to see the nibs to even begin to make a guess, but I can probably narrow it down to Esterbrook, Turner & Harrison, Hunt or maybe Eagle. These were the big manufacturers in the US. They made pens for all kinds of organizations and put their name on it. I just received in the mail today a small box of Pennsylvania Railroad System No. 1 Fine which I'm pretty sure are Esterbrook 048 Falcons.
Most likely you'll never know for sure who actually made the pens. The odds are probably 90% it was one of the above-mentioned companies. There were some smaller manufacturers in the US, but from my experience they tended to just make nibs for themselves under their own name. I've only ever found evidence for the larger companies being able to make custom runs.
Pictures would help, especially if you have a box, which can usually give you an idea of what period the pens are from. Most of the business college pens I've run into are from the teens or 20's to the war, when all the young men went off to war and no one was left to enroll in the business colleges. That's what happened to my grandfather's attempt at starting up a business college. He began Hoosier State Commercial College in 1938 and was really starting to take off and opened a remote branch and a night school, and then the war hit, and it folded after the winter semester of 1941.
If you're really interested in vintage pens outside of the high-performance ones so popular 'round here, PM me and I might have a little to say on the matter.
Andrew, aka vintage steel pen bug infection vector #1