Writing pen

I claim the ornamental design for a writing pen, as shown and described.

FIG. 1 is a perspective view of the writing pen showing my new design;

FIG. 2 is a front view thereof; and,

FIG. 3 is a left side view thereof; the right side view is understood to be a mirror image of the left side and is therefore not shown.

Patent	Priority	Assignee	Title
D624591,	Aug 31 2009	Retro 1951, Inc.; RETRO 1951, INC	Writing instrument
D626177,	Aug 31 2009	Retro 1951, Inc.; RETRO 1951, INC	Writing instrument
D633943,	Aug 24 2009	Faber-Castell Aktiengesellschaft	Writing instrument
D847262,	Feb 14 2018		Pen

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80362,

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