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Pink and Green Gold Solid 14k caps with icicle or "Empire" pattern with 14k Green Gold clips. One of the most recognizable and desirable "51" caps. Pattern was copied for the Limited Edition 2001 Parker "51". All 14K capped "51s" were marketed by Parker as the "Heirloom".
Uncommon Caps
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14k Solid Yellow Gold caps with 14k Yellow Gold clips in "fishscale" pattern. Marked 14K on caps and clips. All 14K capped "51s" were marketed by Parker as the "Heirloom".
Uncommon Caps
Pink and green solid 14k gold caps with Coronet pattern with green gold 14k clips and trim. Pattern is of chevrons in pink gold over yellow gold, with rectangle for engraving. This pattern carried over from the famous Parker Vacumatic Coronet series. Very few pens and pencils have been found.

Extremely Rare Caps
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Parker
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First Year Cap
Lustraloy (stainless steel) caps with gold filled clips and gold filled bands. Also known as a "wedding band cap". Brushed finish on most caps, although some examples are found with a rhodium plating. Most examples have aluminum jewels.
Less Common Cap
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