Lustroloy (stainless steel) cap with raised band and nickel plated clip.  This cap had a matte finish 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. Have yet to find a matching pencil. Less Common Cap

Coin Silver caps with rhodium plating and gold filled clips.  Line pattern of seven lines, space, one line, space, and then seven lines ( IIIIIII I IIIIIII ) repeating all around the caps, and plain cap bands.  These caps are not marked as to silver content (.900).  The plating did not hold up to wear well, and wears unevenly.  Soft metal dents easily.  Very hard to find clean caps with original finish and no marring to plating. Common Caps

Pencil Coin Silver cap with rhodium plating and gold filled clip.  Line pattern of seven lines, space, one line, space, and then seven lines ( IIIIIII I IIIIIII ) repeating all around the cap.  Unlike the production Coin Silver caps, this cap has the same chevron band as regular lined sterling silver caps and is marked "Sterling Silver-Made in USA". This cap was not production and came from a parts lots in Janesville.  No pen cap to match was found. Rare Cap

Gold Filled Caps with gold filled clips.  Pattern is groups of 4 lines and a space, all around the caps, with no cap bands.  Gold content at bottom of cap.  The design carried from the First Year Caps, except that it no longer had a rectangle space for engraving.  These are the most common gold filled caps.   Common Caps