Portion of a golf club head

FIG. 1 is a perspective view of a portion of a golf club head showing our new design;

FIG. 2 is a heel end view thereof;

FIG. 3 is a toe end view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a bottom view thereof.

The broken line immediately adjacent to the shaded area forms an unclaimed boundary of the design. The broken line showing of the remainder of the club head is for illustrative purposes only and forms no part of the claimed design.