Engine suffered a spun bearing. Catastrophic for the crankshaft, but not for the crankcase.
The item offered is a Continental O-300C crankcase, serial number 20393-D-9-C. This item is as-removed from a Cessna 172A (Airframe S# 470xx).  See image for condition and mounting hardware that's still attached.
Part is as-shown in the images above. I am not an A&P and cannot legally speak to the state of the part. We have not run this engine and cannot speak to its serviceability. Please ensure your A&P inspects these products to ensure they are airworthy prior to use! Buyer may inspect and pick-up at KSIF. Product can be crated and shipped for an additional fee. Contact me for details.