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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

In a previous thread, the group showed a lot of evidence that my Wirt half overlay might be an Aiken Lambert with a Wirt nib and feed. https://www.fountainpennetwork.com/forum/topic/294666-early-paul-e-wirt-eyedropper-filler/ I just found a Wirt MHR taper cap eyedropper with Wirt two line imprint on the barrel (too hard for me to get a good pic of the imprint). It has an incorrect nib and feed. So, assuming they are a good fit, might I be better off putting he Wirt nib and feed in the barrel with the Wirt imprint, and leaving the possible Aiken Lambert to be a somewhat no name taper cap half overlay pen?