In general, Pelikans silver pens have a separate plating that helps it resist tarnishing. As you pointed out, this plating can fail leaving a bit of an unsightly mess. The M7000 Anniversary is gold plated silver. While I cant speak to that model specifically, I have other Pelikan pens with gold plated silver that have shown some tarnish over time though this is usually easily polished. Still, you'd have to be careful not to damage the gold plating. I have no direct comparison to say if it is more or less tarnish resistant but it should have some intrinsic resistance. Hope that helps.