Exterior Escutcheon

FIG. 1 is a front, top, right side perspective view of an exterior escutcheon showing my new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a top plan view thereof; FIG. 4 is a bottom plan view thereof; FIG. 5 is a left side elevational view thereof; and, FIG. 6 is a right side elevational view thereof. The broken lines in the drawing figures illustrate portions of the exterior escutcheon and form no part of the claimed design.