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The company strong initial success was due to the creation of the [[Crescent Filler]], which was the first automatic filling mechanism truly reliable. These [[Conklin Crescent Filler|firsts models]] were made in [[BCHR|chased hard rubber]] like other pens of the same period, but their innovative filling system led the company at the top of the market. In [], ''Roy Conklin'' withdrew from company selling all its shares, after that the ownership passed hands several times.<ref>for this event [http://www.penhero.com/PenGallery/Conklin/Conklin.htm] says around 1907, while Michael Fultz says 1904, citing J. F. Vogel as new president, J. H. Doyle as vice president and H. E. Fisher as secretary/treasurer, so we decided to use his date for citing also a lot more details.</ref> In this golden period [[Conklin]] followed a policy of trade expansion, with vigorous promotional campaigns, exporting even in Europe and South America.
In fact, although functional and efficient, the [[Crescent Filler]] had its worst flaw in being unpleasant from an aesthetic point of view, and despite a strong promotional campaign that emphasized its merits (Mark Twain, taken as testimonial, endorsed the advantage of it not allowing the pen to roll down from the table) with the appearance of [[lever filler]] pens the sales began to decline increasingly, despite that the new mechanism was inferior from a purely technical point of view.