John Deere 637 23'7" Rock Disk, 1 Owner, 20” Front Disc’s 18.5" Rear Discs, 9” Spacing, 3-bar Coil Tine Harrow, Hydraulic Fore/aft, Hydraulic Wing Control, Walking Tandem Axles, Bearing Wear Guards, 12.5-15 Tires, Note: See Attachment For Customer Purchase Order, SN: N00637X014295 Make: John Deere, Model: 637, Serial Number: N00637X014295