Gold filled cap with rainbow pattern.  Parker experimented with this pattern before the Parker 61 came out.  It found the production to be too difficult and costly and did not proceed with it at the time.  There is a full version of cap and barrel in the rainbow pattern. Very Rare Cap

Solid 14k Gold Cap and Barrel with 14k clip.  Sold by Parker as the "Presidential".  Smooth design with no pattern, suitable for engraving/dedication.  Only available in full size.  Later version had a gold filled clip.  A unique leather presentation box was designed for this pen.  A matching pencil was available in "clicker" or Liquid Lead models. Other "Presidential" versions are available from the UK and South America in a variety of gold contents, but the U.S. version was only in 14k, and is the hardest to find. Rare Cap

Parker Aerometric Full Sized Lustroloy (stainless steel) cap with chrome plated clip.  These caps had a matte finish with a brushed thin 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

Parker Aerometric Full Sized Lustroloy (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