Dating parker 51 aspxgridview rowupdating event

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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).It was released in 1941 as "51" ink, along with the Parker 51 pen; in 1947 it was made somewhat less corrosive, and renamed "Superchrome".Parker was careful to print prominent warnings on caps, labels, and boxes that the ink could only be used in the 51 (and, later, its economy version, the 21), and would damage any other pen.Other notable members of the 51 series were the Flighter (cap and barrel in stainless steel), Signet (gold filled cap and barrel), Heritage (solid 14K gold trim), Heirloom (solid 14K gold cap and trim), and Presidential (solid 14K gold cap and barrel; 9K and 18K versions in the UK).Sterling silver and coin silver caps were also available, but were discontinued before the introduction of the simplified arrow clip and Aerometric filler.

Aerometric Demis are slightly longer than Vac-filler Demis, and more slender.

Perhaps no other fountain pen has been so unanimously acclaimed as a classic.

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.

); from then through 1948, pens could be single- or double-jeweled -- though double-jewel pens postdating 1946 are very much the exception.

The sectional view below comes from a Parker repair manual from 1947.

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