The ornamental design for a golfputterhead, as shown and described.
FIG. 1 is a perspective view of the golf putter head showing the new design; the shaft, alignment indicator and holes in broken lines forming no part of the claimed invention;
FIG. 2 is a left side view thereof; the shaft in broken lines forming no part of the claimed invention;
FIG. 3 is a right side view thereof; the shaft in broken lines forming no part of the claimed invention;
FIG. 4 is a top view thereof; the shaft and alignment indicator in broken lines forming no part of the claimed invention;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof; the shaft and holes in broken lines forming no part of the claimed invention; and,
FIG. 7 is a rear view thereof; the shaft in broken lines forming no part of the claimed invention.