Putter head
FIG. 1 is a front view of our new and ornamental design for a putter head with the heel of the putter head lifted slightly; 
     FIG. 2 is a top view of the putter head of FIG. 1; 
     FIG. 3 is an end view of the putter head of FIG. 1 from the heel; 
     FIG. 4 is a back view of the putter head of FIG. 1; 
     FIG. 5 is an end view of the putter head of FIG. 1 from the toe; and 
     FIG. 6 is a bottom view of the putter head of FIG. 1.