Ever seen marks like these?

I have an otherwise nice 1961 Proof nickel that has these long marks on it... Most of them are not noticeable until a bright light (like a camera flash) exposes them. I'd guess damage from sliding it into a flip, except for the marks on the lower portions. On the reverse, the marks are more like smudges. Maybe fingerprints?
Kind of sad as this is supposed to be a FS-801 (037)

 

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Welcome to CT @Dtort. Does not look good. Not sure what the marks might be from. Maybe try an acetone dip?

 

Yes, fairly common. Needs conservation and hope the surface is not etched.

 

That's exactly what I was thinking. If it's organic, that should help.

 

Looks like sweaty fingerprints.

 

Welcome to the neighborhood! I don't think those marks were caused by a flip.
~ Chris

 

Residue from 1961 era plastic, perhaps? I think I've seen similar on other proof sets from that era.

 

What a shame. Acetone may help.

Welcome to CT.

 

The acetone seems to be helping! I'll rinse in fresh acetone, let it dry overnight, and take more pics tomorrow to see for sure.
OTOH, based on the Cherrypicker's guide, the coin probably isn't a FS-801(037), even though it seems to have some sort of doubling. Darn.

 

Well, it seems better. I'll try a few more hours.

 

Yay! Sort of. It doesn't show up much in the pics I took, but the marks are almost gone. Thanks for suggesting the acetone bath, guys.