Pen

FIG. 1 is a top front right perspective view of a pen, showing my new design, with the top rear right perspective view being a mirror image thereof and the top rear left perspective view being an identical image thereof;

FIG. 2 is a front elevation view thereof, with the rear elevation view being an identical image thereof;

FIG. 3 is a left side elevation view thereof, with the right side elevation view being an identical image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines shown in the drawings depict a tip and a top of the pen that form no part of the claimed design.