wasmeneh, Welcome to TractorForum. I went to a good site for information http://www.simpletractors.com and found that AC1718H is a model for a Allis Chalmers tactor made by Simplicity. Take a look at Kent's site.
Posted question on the Simple Tractor site. I've got a Simplicity 4211H and a Cub Cadet 1110H. Turns out it's am Argo-Allis which is equal to the Deuze -Allis and the Massey Fergusons amd the Simplicity's of the same age. 17 HP B&S Hydro. Kent psoed a link for me that gave the whole history.
Merry Christmas to All
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