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I claim the ornamental design for an aviation navigational aid pen, as shown and described.
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FIG. 1 is a first side elevation of a pen showing my new design;
FIG. 2 is a second side elevation of the subject pen;
FIG. 3 is a third side elevation of the subject pen;
FIG. 4 is a first end elevation of the subject pen;
FIG. 5 is a second opposite end view of the subject pen; and,
FIG. 6 is an isometric view of the subject pen.
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