New Old Stock Star Gear for the International Harvester Grain Drills Models: 10, 100, 150, 300, 310, 510, 5100, 5300, 620, 6200, 6300, 7100, 7200.
Case IH Star Gear part number: 602554R11.
International referred to some drill models above as "Diskall" in the Implement Manuals.
Came from a dealership liquidation.