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Parker 51 vacumatic dating

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Elaborating on an invention by a University of Wisconsin engineer, Parker came up with an all-new filler system and installed it on a new and visually-arresting line of pens that first went on sale in 1932.These were originally known as "Golden Arrow" pens (inaugurating the new Parker "arrow" trademark designed by artist Joseph Platt), and then as "Vacuum Filler" pens.In 1947 the arrow clip was simplified, eliminating the earlier Blue Diamond mark (for the simplified clip, see the image at the top of the page), and at the end of 1948 the filling system was changed from a multi-stroke pump (taken over from the Vacumatic; cross-section above) to a squeeze-bulb ("Aerometric") with a transparent "Pli-Glass" sac (see photo below).While the earlier filler had the larger ink capacity, the Aerometric was simpler and more robust, with a more intuitive mode of filling and a special vented sterling silver breather tube to reduce the likelihood of leakage during flight. Although the "Pli-Glass" material has often been misidentified as nylon, these sacs were in fact made of PVC (vinyl).Using the words "Quality pen", one letter per year, followed by a quarter marker, allowing for dating within a ten year span. So far the earliest date coded pens found have had the code NL for 1979, and all of these pens were made in the US. By contrast, the Vacumatic came in amazing laminated plastics, made up from sheets of alternating solid and pearlescent colors.Taking advantage of the new filler design, these pens were translucent, allowing you to see how much ink remained in the pen at any point (the ravages of time and ink exposure have made most surviving Vacs rather opaque, although you will still find lightly-used or new-old-stock examples with good transparency).

Nor is it merely a triumph of styling -- though it has a place in the Museum of Modern Art's design collection, and Lazlo Moholy-Nagy found it worthy of praise -- for it is also one of the most robust and practical writing instruments ever made.

The stamp initially had three dots and for each quarter one dot was filed down leaving none for the fourth quarter.

Since production was overlapping examples exist with either the imprint 28 or .8. Also, since this coding system extended over a decade, a pen marked 38 could be produced the third quarter either in 1938 or 1948.

Points, on the other hand, bear the brunt of the pen’s daily activity and are more likely to need replacement.

In any event the point’s date code is frequently hidden inside the section, and are much less useful for dating the pen.