Edited by PenHero on September 7, 2017, 7:02 am
This is a Parker 51 Vacumatic in Dove Grey with Lustraloy cap and gold filled Blue Diamond clip date coded 1948. Parker began phasing out the Blue Diamond clip in 1948 in favor of an Arrow clip like the one that appears on the Aerometric pens launched in 1949. This 5 3/8 inch long pen has the clear plunger filler unit. This version of the "world's most wanted pen" sold for $12.50.