<font color="blue"> . The seller has perfect feedback, but it looks like they have only bought in the past, never sold.
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The other important part of checking feedback is to look at what the person is buying or selling.
The sellers only sales were back in 2001.
Recent purchases were for books and low ticket items. If the recent history showed mechanical equipment, parts, manuals, I'd be more inclined to follow through with some questions. Without a history of dealing in tractor type stuff, I'd tread very carefully.