Portion of retaining block

FIG. 1 is a perspective view of a portion of a retaining block, as viewed from the front, top, and one side of the block.

FIG. 2 is a perspective view of the retaining block portion of FIG. 1, as viewed from the rear, top, and one side of the block.

FIG. 3 is a bottom plan view of the retaining block portion of FIG. 1.

FIG. 4 is a top plan view of the retaining block portion of FIG. 1.

FIG. 5 is a side view of the retaining block portion of FIG. 1, the opposite side being a mirror image thereof.

FIG. 6 is rear view of the retaining block portion of FIG. 1; and,

FIG. 7 is a front view of the retaining block portion of FIG. 1.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.

I claim the ornamental design for a portion of a retaining block, as shown and described.

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