Mallet style putter head

FIG. 1 is a top view of our new and ornamental design for a mallet style putter head;

FIG. 2 is a bottom view of the mallet style putter head of FIG. 1;

FIG. 3 is a back view of the mallet style putter head of FIG. 1;

FIG. 4 is a front view of the mallet style putter head of FIG. 1;

FIG. 5 is a view from the heel end of the mallet style putter head of FIG. 1; and

FIG. 6 is a view from the toe end of the mallet style putter head of FIG. 1.