Those are casting codes. No help there. Look on the left side of the tractor, above and behind the starter motor, on an approx. 3"x3" flat. The serial number is hand-stamped into this flat. Serial number format is model designation above or below sequential production number. Refer to illustration below (note: the serial number depicted in the illustration is from a 600 series Ford tractor. Please disregard).
More information on serial number location, format, and model designation may be viewed by clicking here.