I claim the ornamental design for a putter grip, as shown and described.
FIG. 1 is a front left isometric view of a putter grip in accordance with the present design;
FIG. 2 is a left elevation view thereof;
FIG. 3 is a right elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a top left isometric view of a putter grip.
The broken lines in FIGS. 1,6,7 and 8 represent the bounds of an aperture on the putter grip, shown only on FIG. 8, shows the putter grip affixed on to the shaft of a putter for illustrative purposes only. The broken lines form no part of the claimed design.