I have just acquired this ebonite eyedropper and restored it. The nib is marked: Walker Davison and Co Mansfield. There is no maker information on the barrel. The nib is a fine one and no flex to it. Researching the web I did find a listing For Walker Davison Mansfield Illinois, but no information whether the company made fountain pens
Researching FPN I found a mention of this maker but no history.
Anyone who has knowledge about the origins of this company would be much appreciated.