The ornamental design for the exterior of the rear portion of a groomingmowerdeck, as shown and described.
FIG. 1 is a top left rear perspective view of the exterior of the rear
portion of a grooming mower deck embodying our design in accordance with
the present invention, the broken lines indicating environmental structure
not forming a part of our design;
FIG. 2 is a top plan view thereof, the broken lines indicating
environmental structure not forming a part of our design;
FIG. 3 is a rear elevational view thereof, the broken lines indicating
environmental structure not forming a part of our design;
FIG. 4 is a right side elevational view thereof, the broken lines
indicating environmental structure not forming a part of our design; and,
FIG. 5 is a left side elevational view thereof, the broken lines indicating
environmental structure not forming a part of our design.