Mower Blade 21.25" long x 2.00" Wide x .37"ID Center Hole. 2 outer holes oblong at .38" wide x .93" long and are approximately 2.75" center. CW Rotation. 57209 stamped into blade. Noma.
Mower Blade 23.75" long x 3.00" wide x 1.37"ID hole. Reversable, Flat blade with two sets of cutting edges so it can be flipped over to use both sides. CCW. Stamped 15715.