The rarest series pelikan 400. 14k 585 m medium nib. Tortoise brown shell fountain pen.This is the rarest pelikan 400 model of the 50's era, the very shortly produced pelikan 400n model. This model was made only for around two years, from mid 1955 to mid 1957 and its one of those super rare gems of vintage pelikan pens. Unlike the other pens in these series which were made longer, such the original pelikan 400 made from 1951 to 1955, and later pelikan 400nn made from 1957 to 1965.