Gold Filled Cap with 14k solid gold clip. Pattern is of horizontal and vertical lines forming "windows".  Sold as the "Heritage" model.  This is the aerometric series version, where the "Parker" imprint is superimposed over the lines pattern.   Uncommon Cap

Solid Gold 14k caps with 4 circles going around the cap and 14k clips.  This was the solid gold pattern introduced for the plain arrow clip in 1947 for the vacumatic "51" and carried over into the aerometric series.  Model was sold as "Heirloom" by Parker.  Note the "clicker" pencil, in contrast to the "rotary" pencil in the vacumatic series.    Available in both full and demi size. Rare Caps

Lustroloy Cap and Barrel (stainless steel) with gold filled bands and clips.  Sold by Parker as the "Flighter". Brushed finish.  The later version eliminated the gold bands. Less Common Cap

Late production Lustroloy Cap and Barrel (stainless steel) with gold filled clips, ca. 1957.  Sold by Parker as the "Flighter".  Brushed finish.  The earlier version had gold bands.  Caps are unique to this pen and are of a unique design.  The cap lip was removed, as in much later versions, but the inside clutch was still of the "window" style.  No halo logo on caps. Uncommon Cap