Horizontal grave marker

The ornamental design for a horizontal grave marker, as shown and described .

FIG. 1 is a front perspective view of a horizontal grave marker showing my new design;

FIG. 2 is a right side elevation view (the left side elevational view is the same) of a horizontal grave marker showing my new design;

FIG. 3 is a plan view of a horizontal grave marker showing my new design; and,

FIG. 4 is a front elevation view (the rear elevational view is the same) of a horizontal grave marker showing my new design.

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