FIG. 1 is a top isometric view of a mower blade showing my new design;
FIG. 2 is an enlarged section view of the broken line circled portion of the mower blade thereof, the broken line forms no part of the claimed design;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a left side elevation view thereof.