Gold Filled caps with 14k solid gold clips in "window pane" pattern.  Model was sold as "Heritage" by Parker.  Line pattern of horizontal and vertical lines throughout the cap, and cap band with "Parker".  Gold filled content at bottom of cap.   Less Common Cap

Solid Gold 14k caps with 4 circles going around the cap and 14k clips.  This was the new solid gold pattern introduced for the plain arrow clip in 1947.  Model was sold as "Heirloom" by Parker.  Pattern carried into the aerometric series.     Rare Caps

Parker Vacumatic Demi Sized Lustroloy (stainless steel) caps with chrome plated clips.  These caps had a matte finish with a shiny cap band when new.  Finish was more "brushed" than the later aerometric series caps.  The finish did not stand up to wear too well and quickly wore off.  This was a unique sized cap introduced for the Demi "51" in 1947-1948 with no Blue Diamond guarantee.  One of only two patterns available.  Common Cap

Gold Filled Caps with plain arrow gold filled clips, with pattern of closely spaced lines all around.  Note the "Parker" on the bottom of the cap, over the line pattern.  This was a unique sized cap introduced for the Demi "51" in 1947-1948 with no Blue Diamond guarantee.  One of only two patterns available.  Common Cap