The colours of the Vacumatic Parker 51's and the Aerometric Parker 51's. There are two easy ways to date the early Parker "51". First, starting in , the year of making was printed at the bottom of the tubular nib, but of course dating from the nib is inexact at best, as the nib is one of the most frequently replaced parts. The small digit denotes the year of making for the barrel. This digit was deleted on the US made pens in but continued until on European and Canadian? Note the distict features, Double aluminium jewels, metal filler with diamond imprint. The Parker "51" came in 4 basic different styles.
NEW! Parker 51 Aerometric Midnight Blue - Restored And Working
Parker "51" Vacumatic Filler "First Year" The Parker "51" commonly referred to as a "First Year" pen is really a pen from late through They can be easily distinguished from later production by several unique characteristics. All pens of this period are double jewels, meaning that they have a decorative "jewel" at the top of the cap and at the end of the barrel. The imprint on the majority of these pens is at the end of the barrel, near the decorative "jewel", all in one line.