A modern thermoplastic with great clarity and durability used to make caps and barrels for many contemporary pens.

A nib type first introduced on Wahl Dorics and later on the Wahl Coronet line. The nib has a slide on top that adjusts degree of tine spread and hence flexibility and line width. In contemporary nibs, it is found on the Pilot Justus, for example.

Introduced on the Parker 51 in 1949 as the Foto-fill. The barrel unscrews to reveal a sac surrounded by a metal casing which is depressed by hand for filling. The name was later changed to Aerometric. Similar filling systems were adopted by other manufacturers.

Type of filling mechanism in which the bladder and a pressure bar are exposed and the filling is done by squeezing the bladder to cause a suction.

One of several terms used to describe the discoloration of pen parts (caps and barrels), especially those made of celluloid, due mainly to the effects of ink and rubber. This discoloration is not only superficial but affects the entire material of the pen.

Hard rubber discolors in response to outside influences, including water and light, which induce part of the sulphur to appear on the outside of the pen, thus turning it from ebony black to olive green. This discoloration is only superficial and the original black color can usually be restored.

Parker's arrow logo first appeared on the clip of the Golden Arrow, the forerunner of the Vacumatic. The arrow was used on most subsequent Parker clips and also on nibs and other parts.

Parker used an arrow shaped clip beginning with the Vacuum Filler pen [Vacumatic].

Parker's distinctive nib with a boldly imprinted arrow design.

Many Sheaffer models were made with a wide cap band, often in 14k, to allow for the engraving of the owner's signature. These were known as autographs within their individual model lines.

An extremely rare and valuable Parker eyedropper filling pen with an Aztec Indian relief design. Made around 1911, only a half dozen or so are known to exist.