FIG. 1 is a perspective view of a portion of a watch housing showing my new design;

FIG. 2 is a top view of the portion of a watch housing shown in FIG. 1;

FIG. 3 is a right side elevational view of the portion of a watch housing shown in FIG. 1;

FIG. 4 is a front elevational view of the portion of a watch housing shown in FIG. 1; and,

FIG. 5 is a rear elevational view of the portion of a watch housing shown in FIG. 1.

The phantom line representation of the watch band and the remainder of the watch housing is for illustrative purposes only and forms no part of the claimed design.