The Parker 51 is generally agreed to be one of the genuinely iconic fountain pens, for its timeless design, revolutionary construction, efficiency, unparalleled durability, and for being a great writer. It is also among the most sold pens of all time, having been available from 1941 until the early 1970’s, manufactured in plants around the world, and sold millions. Within each major model there are myriad combinations of color, cap, and other details that have made collecting 51s a serious sport around the world. 51s are available in two lengths: the typical 51 is 5 3/8″ long, but there are also demis, 4 13/16″ long. They are excellent writers, hold a great deal of ink, and are great shirt/jacket pocket pens. Parker 51s are readily available today, although some of their colors and cap patterns are rare.