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			 The ornamental design for a golf putter head, as shown and described. 
			  
			  
			  
			  
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FIG. 1 is a perspective view of my golf putter head;
FIG. 2 is a right side view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 is a rear plan view thereof.
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