There should be a number stamped on the left side of the tube just in front of the transmission. There should also be an aluminum sticker plate on the left front of the sheet metal near the radiator. I don't think there are records for the serial numbers and year of manufacture. You can search the Mitsubishi/Satoh group here and read for days. These 370 tractors were made mostly in the 70s. At this age, the year it was made is not very important.