Most Sold Fountain Pen in the World One of the most useful fountain pens ever produced is the Parker 21. It's hard to break, never leaks, and always functions. Parker 21 is the first pen that had the nib under a hood, the thought behind this was not to let the ink have a chance of drying on the way from the ink reservoir to the paper Parker 21's body was made to resemble a jet fighter from the side, and its nose was made of the same Lucite material as some wartime aircraft. cone-shaped Included are the Olive Green Parker 21 Lacquered and Scratch-Resistant, Stainless Steel Fine Nib, Brushed Steel Cap, and Shiny Chrome Trim. Parker Squeeze Converter for Ink Combine with a bottle of Parker Quink Ink. Parker's Preferred Collector Item