The John Deere LA135 was labeled as "special edition" or "limited edition", depending on the year. For a $100 price increase over the LA125 the tractor offered a two-cylinder engine, high-back seat, larger tires, and front bumper.
I have a LA105 and I see a picture of the choke sign on the dash but have no clue where the knob or lever is.
The choke is engaged at the full throttle position. Once the engine is running the throttle lever should be moved just below this position to disengage the choke.