2010 Ralph Prather Parker “51” replica in titanium with smooth sterling silver cap. There have been countless reproductions of the 51, no one has made these with more attention to detail than Ralph. In fact his pens are more a tribute than a copy, since he has added his own touches in the form of custom fillers, trim rings and buttons as well as a slightly more streamline shape. This pen comes out of my collection, where it is a duplicate of sorts. $650.00.