FIG. 1 is an upper front perspective view of a pen showing my new design;
FIG. 2 is a front elevation view thereof, with the rear elevation view being a mirror image of the front elevation view;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a right side elevation view thereof, with the left side elevation view being a mirror image of the right side elevation view;
FIG. 6 is an upper front perspective view of an alternate embodiment of the pen shown in FIG. 1.
FIG. 7 is a front elevation view thereof, with the rear elevation view being a mirror image of the front elevation view;
FIG. 8 is a top plan view thereof;
FIG. 9 is a bottom plan view thereof; and,
FIG. 10 is a right side elevation view thereof, with the left side elevation view being a mirror image of the right side elevation view.
The broken lines showing a portion of the bottom of the pen in FIG. 9 are included for the purpose of illustrating environment and form no part of the claimed design.