By the end of 1950, Eversharp had fallen into crisis, leading to its acquisition by Parker starting in 1957. The Eversharp name continued to appear on several Parker pens until 1968. One unique aspect of this particular pen is that it was manufactured by Penol in Denmark in 1964. Another unusual feature is its ink feed system, which uses two nylon threads. It is an extremely rare pen and operates with a Parker converter.