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What does each number mean in the serial number? I know the second is the year

The 1st # is involved also in determining the yr made. In some examples the first 3 digits.

Grasshopper Lawnmower Parts - Grasshopper Mower Parts Diagrams - The Mower Shop, Inc.

Scroll down about 8 pages worth.

Also,... just one example that the remaining #'s (to me) are just sequential #'s