[CR]Damaged BB shell on MKM?

Could anyone shed some light on what might have caused the groove seen on this bottom bracket shell?

http://ebay.com/<blah>

or ebay item # 7187890283, and blow up the pic of the BB shell.

Any speculation on whether the BB shell is usable as it is, or would repair/replacement be necessary? If it's repairable, what would need to be done?

Thanks!

Tom Adams, busily downloading VR5 pics back home in Shrewsbury NJ

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