I'd guess around 1958. We had a local agricultural fair and the John Deere tent always had toys on display. If we'd had a good year on the farm, Dad would buy me a toy. I can remember 2 cylinder models, a manure spreader, a Model 12 combine and a MC or 40 crawler and later a New Generation tractor and a 3 bottom plow.
Many happy hours in a corner of the garden plot.