The ornamental design for a headportion of a hammer, as shown and described.
FIG. 1 is a front right side perspective view of the head portion of a hammer in accordance with the present invention;
FIG. 2 is a left side elevational view of the head portion of the hammer of FIG. 1;
FIG. 3 is a top elevational view of the head portion of the hammer of FIG. 1;
FIG. 4 is a front elevational view of the head portion of the hammer of FIG. 1;
FIG. 5 is a rear elevational view of the head portion of the hammer of FIG. 1; and,
FIG. 6 is a bottom elevational view of the head portion of the hammer of FIG. 1.
The left side view of the head portion of the hammer of FIGS. 1–6 is omitted as being a mirror of FIG. 2. The shaded area(s) represent(s) the bounds of the claimed design. All broken lines represent the remaining portion of the hammer, which is provided for illustrative purposes only and form no part of the claimed design.