The numbers all look good. 285 means 1850, 8 means Ag front wheel assist, 2 means diesel engine, and the other two are tire codes, but I'm not 100% sure on those.

188 533 is the serial number, putting it into the 1967 model year. 431 is the transmission code, which is the regular speed 1850 with front wheel assist. (Long pinion shafts had a separate code from tractors with transfer cases.)

So everything looks good, especially that tractor. Care to haul here to Michigan? I can assure you it would have a good home here. <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->