FIG. 1 is a front perspective view of a hammer showing our design;
FIG. 2 is a left side elevational view, the right side elevational view being a mirror image thereof;
FIG. 3 is a front elevational view;
FIG. 4 is a rear elevational view;
FIG. 5 is a top plan view; and,
FIG. 6 is a bottom plan view.
The broken line portions of the disclosure are for illustrative purposes only and form no part of the claimed design.