MMike posted a valid list of serial number grouping per year. If you tractor has a different serial number then it is an export version. If just makes some parts cost a bit more. Most all the exports where diesels which was the tractor of choice in Canada and overseas .MF135's like your can be found all over the globe. Make in several countries. France, India, England. Serial numbers are mostly to identify the year made. Engine block numbers only show what kind of engine but doesn't tell you when the tractor was made. The xport MF135 had many desirably features not found on US models. Good luck with your tractor.