End cap for a pen

FIG. 1 is a perspective view of my new design for the end cap of a pen;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of a modified embodiment of my new design.

The broken lines in the figures are for illustrative purposes only and do not form part of the claimed design.