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I could not find any pictures or references to this pen, or rather the filling mechanism used by this pen, except a single ad from 1915. So I am posting this for scholarship purposes as well as for fans of Paul Wirt, fans of filling mechanisms, or for pen history fans. The patent on the pen is Apr 7, 1903. This seems to be referring to patent numbers 724,983 and 724,984. These are Wirt patents for feeds, not the filler. Scanning Wirt's patents (listed many places, including FPN here), he does not have a patent for this filler. It is unclear if it was someone else's patent. It seems unlikely that Wirt invented this but failed to patent it, given the large number of patents he held for pen related inventions. Pictured is an unusual filling system from Wirt, c1915 per the attached ad. The Wirt ad states that you pull out the bead and twist 1/4 turn. The exposed portion rotates a pressure bar. There is a groove inside the barrel. The section end of the pressure bar has a "tooth" on the side to catch the edge of the groove. The far end is attached to the filler device that extends out of the pen. Pictured: The pen. The filler: closed, extended, and turned clockwise. Interior: groove, bar, and bar as it rotates

The self-filler is a New York pen from about (I would guess) 1924. It is fitted with a Pat. 1915 clip. The leverless was a bit of a pain; English from about 1933, its internal mechanism had rusted away and the fact that it is thinner than the standard leverless pens of the period (e.g. L200/60) made the repair trickier than it might have been. And of course the nib was bent too. Anyway it works now and as I hope the writing shows, it was worth straightening the nib! The colour difference is interesting I think, the New York pen being quite a bit darker; perhaps there was more "gold in the rolling"? Rgds Cob.