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Is There Any Way to Tell How Many "Attempted" Crossovers Were NGC?

I know there are online statistics for how many coins were attempted to cross from one TPG to PCGS, but how many of those coins were ANACS and ICG? Wouldn't grades from these 'lesser' TPG's skew the results?

Are there any stats on how many NGC coins, specifically, were attempted or successfully crossed to PCGS?

And how high do you think the success rate would be? Instead of ~40% for all TPGs, do you think it would be more like 50%? 60%?

Just a thought image
Lurking and learning since 2010. Full-time professional numismatist based in SoCal.

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