There are 9 great mowers in the world.  Simplicity makes 8 of them.

[Source:  Simplicity Lawn Tractors catalog, Form No. 21-005, hand-dated 10/12/72, courtesy of Chris Geise]

[Source: Simplicity ad, date unknown, courtesy of Ed England and Sam Ericson]

NOTE:  There is another complete set of information on the Allis-Chalmers product line.  Most of the tractors are identical, except for trim and colors. Simplicity owners may want to consult the model cross-reference table, and check out the corresponding Allis-Chalmers model.