The best I can come up with it is a 1960 601-Workmaster Diesel. Bought in Taylor Texas new by Myles Williams. He had a construction company Soley & Williams Construction where he used the tractor pulling a roller to pack down the roads. Mike Williams ( son) took over the company and continued to use the tractor.  

About 2002 he closed the company, but he kept the tractor and took it down to his ranch in South Texas where he mowed grass with it. In 2016 I bought the tractor which made me the second owner. I then started to restore the tractor and found about Steiner Tractor Parts. I bought all my parts from them and when I needed help they were right there and gave me the help I needed. I use the tractor today on my acres keeping it clean. I will be looking at the old tractor for many years because I had to promise Mike I would not sell it before he would sell it to me.

Scott Hohman
North Collins, New York