The stamp initially had three dots and for each quarter one dot was filed down leaving none for the fourth quarter.
The first date codes, found for example on the Vacumatics, consists of two digits, the first one denoting the quarter of production, the second denoting the production year.
In mid 1934 Parker began marking most pens and pencils with a date code, both the barrel and the nibs were marked, but lacking a date code doesn't necessarily mean that the pen was made pre-1935, since many imprints have been worn off with use.
Right Oblique has the largest surface on right sided of point. 0.000039 inches) To be stamped 10K the layer must equal at least 1/10 of the total weight of the item.
For very heavy lines on the down stroke and medium lines on the side stroke 14k 73 74 Fine Oblique Italic right hand 18k 75 Medium Right Oblique 14k 75 Medium Oblique Italic right hand 18k 76 Broad Oblique Italic right hand 18k 77 Fine Oblique Italic left hand 18k 78 Medium Oblique Italic left hand 18k 79 Broad Oblique Italic left hand 18k 79 Medium Left Oblique-For those who slant the pen when they write.
In 2000 the code again underwent a small change when the quarter switched sides with the year and there was a dot between them "Q.