JD 850 S/Ns (by year)
Year S/N range
1978 1024 - 3858
1979 3859 - 7388
1980 7389 - 11337
1981 11338 - 12480
1982 12480 - 14282
1983 14283 - 16005
1984 16006 - 18000
1985 18001 - 22000
1986 22001 - 25500
1987 25501 - 28336
1988 28337 -
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JD 850 S/Ns (by year) 