The ornamental design for a protective endcap for a ball point pen, as shown and described.
FIG. 1 is a side elevational view of a protective end cap for a ball point
pen showing my new design, a ball point pen being shown in exploded
condition therein in broken lines for illustrative purposes only.
FIG. 2 is a top plan view thereof; and
FIG. 3 is a bottom plan view thereof.
The tip of the cap and the cylindrical portion thereof are stippled to
indicate that the colors thereof are the same, and are contrasted with the
color of the conical portion.