The ornamental design for a putter having a flatangled shaft and a singlegrip, as shown and described.
FIG. 1 is a right side elevational view of a putter having a flat angled shaft and a single grip which forms my new design, this side and the opposite left side elevational view being mirror images, the broken lines of a putter head in this and other figures being for illustrative purposes only and forming no part of my design;
FIG. 2 is a front elevational view thereof, this view and the opposite rear elevational view being mirror images; and,