This slide came from Ken Ohnell. This image also appears on page 91 of Farm Tractors 1950-75 by Lester Larsen. The model is identified as a Model 1200 (Douglas Steiger says the smaller machines were Model 105s). The machine is freshly-painted, and the paint scheme resembles the one on the Steiger Model 105 #4.
From Steiger Model 105 Tractors