The ornamental design of a diamond-shaped central section defined by grooves on a face of a golfclub head, as shown and described.
Also incorporated by reference herein in their entirety are U.S. Design Patent Applications titled “Golf Club Head” (Ser. No. 29/193,840), filed Nov. 17, 2003, and “Golf Club Head” (Ser. No. 29/193,839; now U.S. patent No. Des. 496,420), filed Nov. 17, 2003.
FIG. 1 is a front view of a diamond-shaped central section defined by grooves on a face of a golf club head according to a preferred embodiment of our new design.
The broken lines in an area surrounding grooves in accordance with our new design are illustrative of exemplary golf club heads that show environments in which a diamond-shaped central section defined by grooves on a face of a golf club head are associated. The exemplary golf club heads do not form a part of the claimed design.