Parker 21 vs. The easiest way to identify the Super 21 is by the clip. The standard 21 (both the original Mark I and the updated Mark II) have plain clips (convex on the Mark I and concave on the Mark II) while the Super 21 has a quite modern-looking Parker arrow on it.

When was the Parker 21 made?

1948 Parker Introduced the 21 in 1948 as a School pen based on the Parker 51 design. All are Aerometric fill with Steel nibs. There are 2 distinct versions the Mark 1 and Mark 2.