A couple of years ago I scoured the Making of America archive and came up with a bunch of early fountain pen ads.
The post is here http://www.fountainp...merica-e-texts/
A lot of them are late Victorian, for the period you're specifically looking at, try the Moore's Non-leakable Fountain pen ads, or the later Waterman ones.
What specifically are you researching? I've done a fair amount of research in that period on steel (dip) pens, but a lot of the same resources can be used. I'd be happy to help.
One place you can start is David Nishamura's Vintage Pen Blog. He's also put together the premier list of online editions of The American Stationer.
I've captured a few of my research resources, and will be adding more, over at my new blog The Steel Pen. The direct link to the posts on research resources is here.
Check out my Steel Pen Blog. https://thesteelpen.com/ .
"No one is exempt from talking nonsense; the mistake is to do it solemnly."