In fact, as a group, the vintage Parker Duofold fountain pens from the 1920s are extraordinarily beautiful writing instruments. Jade pens made out of a branded plastic called Permanite were sold in a variety of sizes (Junior, Ladies, Senior) and in sets with matching mechanical pencils. Some Duofolds had pearl handles and caps, veined with black plastic. Apple green and "Modernistic blue" were other popular colors, as were moiré-patterned fountain pens, which ranged from pink to blue.

The Vacumatics followed the Duofolds in 1932. These pens held twice as much ink as those that had preceded them (102 percent more, to be specific), and, for the first time, the clip on the cap was shaped like an arrow, which would become a symbol of the Parker brand. These were also Parker’s first mass-produced pens. Some had horizontal layers of silver alternating with translucent plastic, which allowed the user to see how much ink was left in the pen. Codes were printed on all Vacumatic barrels, making them relatively easy to date today.

A Junior Vacumatic was introduced in 1934—the Golden Web pattern from that series lasted only from 1936 until about 1938, making it a particularly prized Parker for collectors. Even more rare is the Imperial Vacumatic from 1939, which was produced to compete with the Sheaffer Crest.

That same year, 1939, the company finished developing the pen for which it would become best known, the Parker 51. Released in 1941, the pen used a new, quick-drying ink, which meant that the ink in the pen had to be carefully sealed from exposure to air. A molded internal "collector" kept ink at the ready without drying out. Its tough Lucite body was sleek, and its cap resembled the nosecone of a fighter plane—in fact, Lucite had been developed for the canopies on such planes. No surprise, then, that the Parker 51 was chosen to sign the peace treaty between the U.S. and Japan at the end of World War II.

The original Parker 51 had a quick-action, vacumatic-type filler, but in 1948, this was replaced with an aerometric filler, which was actually similar to some of the sleeve-filler systems that had been around for 40 years. 1948 was also the year the pen’s arrow clip was redesigned.

Parker 51s are not especially valuable, so collectors who want to actually use one to write with would do well to choose a post-1948 model, since they tend to work better. For collectors who want to find a 51 to put away, look for models with solid-gold caps, Empire 51s, pens with small aluminum "jewels" at the bases of their clips, and the pre-production models tested in Venezuela, Columbia, Spain, and other climates with high humidity to test the tolerances of the ink.

Other notable Parker pens from the post-war era include the Parkette, a low-priced, lever-filler model from the early 1950s that looked like a 51 but was marketed to students; the Parker Jotter, which was Parker’s 1954 entry into the ballpoint pen wars (the 51 Jotter resembled the famous Parker 51); the self-wicking (but, at $20, expensive for its time) Parker 61 from 1956; and the Parker 75 of 1964, whose silver, engraved, grid-pattern body was an instant classic.

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