Rear bumper for an automobile

FIG. 1 is a perspective view of a rear bumper for an automobile showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The claimed design is indicated by the relatively dark portions in the figures. The relatively light portions form no part of the claimed design.