The Improved Post Fountain Pen
I’ve just acquired the CS “The Improved Post” fountain pen. (Tried to upload photos without success)
My research shows it was released in 1906 and described as The “improved Post self filling, self cleaning, non -leakable” (syringe filler) pen.
Apart from that I can found out little else so any further info - how it works (what is the little piston used for?) etc. would be much appreciated.