WOW, hard to call that one. I don't remember ever seeing a sears cab with the metal front over the clutch pedal like that. Most were vinyl or canvas.
This sure looks like the older "Cozy Cab" models that were used by deere, cub, and I think possibly bolens. they had the metal front panels on some of their cabs.
All of the sears cabs were built by "the original tractor cab company" if it was a sears, it would have a tag under the roof, that starts with 922.XXXXXX.
Both Cozy cab and the original tractor cab company built for several manufacturers, and are very similar in appearance..
Without a model number.. I'd say it's impossible to tell just from that picture.