First, welcome to OCC......
The tractor is of the 70/100 Series. The ONLY difference between them is the Horsepower of the motor, 7HP or 10HP.
To determine the horsepower, look at the Kohler Engine Tag. If it indicates a K161 = 7HP, or if it indicates K241 = 10HP.
It "appears" to be a 10HP Cub Cadet 100. The 10HP motor sets a little taller than the 7HP model.