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 20.50" long x 2.50" wide x .75"ID center hole, outer holes .38"ID. CW. 1720679 supersedes to 1687014. This is part number 1720679 new OEM Simplicity.
Mower Blade 18.12" long x 2.50" wide x .75"ID hole. CW. New OEM. Serrated / Toothed Lift Wing. New OEM Simplicity part number 1721086. Blade stamped 1721086 Simplicity.