date wise possibly c. 1915 - 18 perhaps, but not sure - the model is THE SWAN PEN and shown as made in New York. The cap carries the No. 4500 and is minus any chasing - at the end of the barrel it's stamped '4570 Brd.' - I've a feeling the two parts are a mismatch, possibly, as the barrel does have a chased pattern.
But it's the nib and internals that are more interesting ……………… the nib has a metal overfeed channel, which I have seen before, but it's the unusually shaped feed carrying a pull out wire that's a first for me - when fitted it tucks in neatly below the feed almost right up to the section, then pulls out as can be seen.
Presumably the mechanics of this set up had a specific purpose - was it to keep the ink flowing and/or break surface tension of the ink, or might refilling the pen have been carried out by simply removing this component?
thanks for looking.