Back portion of a golf club head

FIG. 1 is a rear perspective view, toward the toe of a back portion of a golf club head showing a rear surface of the new design;

FIG. 2 is a rear perspective view, toward the heel of the back portion of the golf club head showing the rear surface of the new design;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom view thereof; and

FIG. 5 is a left side heel view thereof; and,

FIG. 6 is a partial enlarged cross sectional view taken on line 6--6 of FIG. 3.

The broken line showing of the club head of FIGS. 1-5 is for illustrative purposes only and forms no part of the claimed design.