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Recognize this single disc?

Reader Ronald Pins, P.O. Box 71688, Des Moines, IA 50325, is wondering if anyone recognizes a disc he owns:

I’m hoping a Farm Collector reader can help identify this disc, the manufacturer, model and approximate year built. It has faded orange or red paint. It is a 10-foot single disc with a tractor drawbar hitch. Numbers were found on blade scrapers (310527L on one side and 310528R on the other) and disc bearings (300625 on one side and 300626 on the other). There is no serial number tag on the disc.

Recognize this single disc?