The Parker 21, like the 41, was a sequel to the Parker 51 line. In the case of the 21 the objective was to provide a lower price point option. Following that was the introduction of the Super21 which was an upgrade to the standard 21 with improved plastic and 51 style clutch ring.
This particular example is in the grey.
Nib: Octanium (Steel) hooded nib (Fine).
Filling System: Aerometric
Condition: Very good overall condition with general signs of wear. Note that the clutch ring is from a 51 or 51 "Special". The sac has been replaced and the pen fully cleaned. Please see the photos for a complete photographic assessment of the quality of the pen.
Country of Manufacture: United States
Made by Sheaffer in the United States, Restored by Fifteen Pens in Ottawa Canada
Comes with a 1 year warranty