Sheaffer's name for their early plastic. Sheaffer made the first plastic pens in 1924. Celluoloid as well, like Permanite and Pyralin.

a pen with a ring for a chain or ribbon on top instead of a pocket clip. These are usually lady's pens since it was considered inappropriate for women to wear pens in an external pocket.

another pattern used to adorn hard rubber pens. Ripple designs are best known in Waterman's pens and came in several color patterns.

Most pen cracks are found around cap lips and come from caps being posted (placed on barrel end) too firmly. They are especially common in red hard rubber which becomes quite brittle with age. However, cracks can occur in other locations on a pen as well as in metal parts including nibs.

Wahl's exclusive clip that had a small ball at the end that aided in moving the clip over pockets. Wahl probably obtained the patent for the clip when they purchased the Boston pen company.

Swirled combination of red & black hard rubber to create a more attractive pen before the advent of more vibrantly colored plastics.

a special line within Parker's Challenger series. Royal Challengers had a distinctive sword clip early on which was changed to a stepped clip. They are also distinctive in their herringbone design in three colors: gold, silver and burgundy.