I thought that UK and US Mabie Todd pens were the same in the early part of the twentieth century but I have never seen a British Swan like this American one.
Unlike most Swan eyedropper fillers it is chunky and flat-ended, quite like a later Blackbird BB2/60 lever filler in fact. As if that was not confusing enough, the Clipper accommodation clip was made in England.
This pen was used by employees of the New York Telephone Company and it may be that this model was especially made for bulk sale to businesses.
Finally, I would find it difficult to show another example of this unusual, long section in a British Swan. A handsome pen with attractive chasing.
With thanks to Rob Parsons