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    Parker 51 vacumatic dating

    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).By contrast, the Vacumatic came in amazing laminated plastics, made up from sheets of alternating solid and pearlescent colors.

    The sectional view below comes from a Parker repair manual from 1947.The smart new arrow clip was fixed to the top with a handsome jewel screw, and a similar bit of trim was found on the blind caps of most of the earlier Vac models (the arrow clip and top jewel would remain a Parker hallmark through the 1970s).The points had a "golden arrow" engraving, set off (in earlier models) by two-tone plating.The Parker 51 went into production in 1941, and remained a best-seller for decades thereafter.The majority of examples in circulation, however, date from the 1950s.

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