The very early Waterman's eyedropper pens were made at a time when the vast majority of pen users were still happy with dip pens and, presumably, needed some persuasion to fork out a lot of money for a new fangled ink containing device.
In about 1891, Waterman released a pen that was as much like a dip pen as it could get in terms of size, proportions, and feel:
This is the pen, a Waterman's 23, the '2' denotes the taper cap and the '3' is the nib size. Made in hard rubber with a good degree of flex, it is still a joy to use.