I first saw the Cletrac at an exhibit in Milton and then at ploughing matches in N. Dumphries and Elgin County, It is unlike any tractor I have ever seen, This unit is likely from 1918. After World War I the Clevland Tractor Company advertised the tractor as a "Tank Type" tractor. 

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"The Cleveland Tractor receivedd some modifications in 1918, the most significant if which were the substitutions of the Buda engine with a Weidely M power unit and the strengthening of the track frames - this new version was to become known as the Model H." Info from the Farm Collector

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I had just finished two pen and inks of Military Tanks to commemorate the many WWWI and WWWII anniversaries. Many similarities