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"Jim, \n  \nHolt was manufacturing Caterpillar tractors in 1920 and before. Do this search and look at the manuals and trademarks. I also found a 1921 Holt Caterpillar picture in my first search, but haven't tried again, since the manuals seem to suffice. \n  \nhttps://www.google.com/search?tbo=p&amp;tbm=bks&amp;q=inauthor:%22Holt+Manufacturing+Company%22 \n  \nI see your point on Best, so maybe I am mistaken.  You are saying that it is a Caterpillar 60, but is a design by Best, which didn't use the Caterpillar trademark, so it must have been a model 60 built after the merger.  Let me do some more research!! \n  \nBTW, a glance at that truck in the background looks WW1ish. Lots of surplus WW1 trucks just after the war....not conclusive. \n  \nDave \n  \nkeep the Show on the Road \n"
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>