FIG. 1 is a front view of putter head embodying my new design; FIG. 2 is a rear view thereof; FIG. 3 is a right side view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a plane view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a cross-sectional view taken on line 7—7 of FIG. 1; FIG. 8 is a cross sectional view taken on line 8—8 of FIG. 3; and, FIG. 9 is a top perspective view of FIG. 1.