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Parker Aerometric Full Sized Lustraloy (stainless steel) cap with chrome plated clip. These caps had a matte finish with no lip. Finish was more "brushed" than the earlier caps. The finish did not stand up to wear too well and quickly wore off.
Common Cap
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Gold Filled cap and gold filled clip. These very late production caps had "51" added to the cap lip. Available in fountain pen, pencil and ballpoint pen.
Common Cap
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Solid 18kt gold cap and barrel "51" in twisted cable pattern. Made by Cartier.
Rare Pen
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