Another name for the popular miniature pens of the early part of the 20th century. Most manufacturers made these, and some were very ornate and gold or gold-filled. They were working pens, usually eyedropper-fillers but sometimes lever-fillers.

The first synthetic resin, seldom used in pens because of its extreme brittleness. Parker did make some Bakelite eyedroppers and early button-fillers. Note: this is not pronounced "bake-lite," but rhymes with "bagel-ite," for the man (Leo H. Baekeland); who invented it in 1907. It was replaced by celluloid.

Sheaffer's name for the streamlined pen design that most manufacturers moved toward in the early '30s replacing the flat-tops of the '20s.

almost all pens using a rubber ink sac employ a bar inside the barrel that presses against the sac. The bar is activated by a lever, button, crescent, coin etc. One rubber sac pen that does not use a pressure bar is the Twist Filler.

Nickname for Parker's red Duofold Senior size. The name was also used for a Parker ballpoint replica in 1972.

Black and pearl pens were made by most major companies in the late '20s and '30s and are one of the colors most prone to discoloration. Perfect color in black and pearl is extremely rare, and many collectors have never seen a specimen. Even pens which were never inked almost always show some discoloration due to the natural aging of this plastic.

A series of huge hard rubber pens made by Parker in the early part of the 20th century. A Red Giant was also made of red hard rubber, and while both pens are very rare, the Red Giant is by far the rarer of the two.

A rare Wahl/Eversharp color that is a deep blood red with lacings of black across the surface. If you find one, call me!

Best known blow filling pens are those by made by Crocker in the early days of fountain pens, although Sheafer made some as well. Air blown through a hole in the barrel depresses the sac inside. When the blowing stops, the sac reflates and draws in ink. Most often found on vintage Crocker pens, but there is currently some experimentation with small pen manufacturers today.

Introduced in 1939 on the Vacumatic, the blue diamond at the top of the clip signified Parker's lifetime guarantee as did Sheaffer's white dot. The blue diamond was also used on the Vacumatic filling 51s through the '40s.

A nickname given to the Eversharp Ventura which was the last pen produced by the company prior to its purchase by Parker. The burp pen supposedly relieved itself of air pressure in the sac resulting in a more consistent ink flow.