Grab it for that price!!  850 hours is nothing, IF, it has been taken care of. You should be able to check the oil, run it with throttle up for awhile, just go with what your gut tells you.
I would think if the motor is in good shape another 1000 hours or more would be acceptable.
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DWayne
1973: 128, ag tires, 3pt. lift, spring assist, lights, 42" Deck
10" moldboard plow
2016 XT1 42" deck 18HP
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