J, yup, that is factory cosmoline. If you are going to BaT then leave it there. Let the next guy decide if he wants to leave it or remove it. Sure you will get some undereducated questions asking why you left the brown "mud" in place... But they will be backhanded soon enough by the BaT contingent and everyone will be happy.
Best of luck with your auction. Factory white 930 Fuchs are awesome.
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