Can anyone help me identify the model and/or year of this tractor? With about 850 hours what's a fair price?
With the seat higher than the tires it has to be smaller than a YM195D.
The color green was on the US-model Yanmars until around 1980. What they offered in the late 70's was YM135D and YM155D. The version of air cleaner, and the medallion on the side of the hood, indicate that this is from the final year or so of those models. So sold new about 1980.
The model number is the prefix of the VIN stamped by the operator's left ankle, so ask the seller what it says there.
And the model number on the US Yanmars is the engine horsepower. The same tractor, Japan-market version, shows the horsepower available at the PTO as the model number, ie YM195 = YM1700. (US models had a few minor changes and updates).
Take a look at the photos in these TractorData descriptions.
YM195
YM155
YM135
The 3-digit hour meter is just a maintenance reminder, can't be interpreted as total hours. But the difference between 850 hours and 1850 might be obvious; original vs replacement seat for example. In any case more hours don't seem to hurt anything until the whole tractor looks pretty thrashed, then be cautious of bogus repairs or unrepaired problems.
A YM155 would probably have been sold with a 42" mower. It should run (and lift) a 48" if you are sensible. Forget a larger rotary mower.
$2600 is reasonable for excellent condition. Less, if it isn't.