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The 1020 was a Dubuque, Iowa design. It was done with the idea of being made in several other plants around the world. The 820 and 1520 were derivitives of the 1020. The 1020 and 1520 were amde in both Dubuque and Mannheim. The 820 was Mannheim only. The 820 is bascially a 1020 with smaller wheels. The 1520 is larger all the way around, like a 1020 on steriods. The engines were made either in Dubuque or Saran, France. Eventaully, all the smaller 3 and 4 cylinders were built in Saran. The model lived on into the 1976 model year as the 830. There is no real difference in the 830/1030 over the respective 20 series, but the larger machines were changed in 1973 and the little ones were renumbered to fit into the series. When the 40 series came out, the 1030 got more displacement and wound up as the 2040, with the 1530 getting the same treatment and becoming the 2240. The 830 size was then dropped to be replaced by a whole lineup of Yanmar built machines. I see decent condition 820 running in the $5-6k range around here (Raleigh, NC), with some folks asking in the $8k range. There is a large demand for landscape tractors around here, so the prices tend to be inflated. I was looking for one last summer (820/1020), but wasn't thrilled with the idea of spending $6k for a well-used machine. I decided to go to JD and buy a new 4500 instead, with many more features, plus being new. Of course, that cost more than two 820's ($18k), but to me it was worth the cost (I love that power-shift reverser transmission).
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