[MVSNYC]

Hi Corey, long time, no speak, hope you're well.

I'm surprised SGC will no longer slab Blank Backs, God knows they've slabbed a ton of them over the years...to your point, I would imagine they'll still authenticate ("A") and slab Proofs; as you said they are a different animal and have characteristics (proof cross-hatch marks, perfect registration, etc) that further distinguish them from simple Blank Backs...Regardless, I think an expert can tell if a card has been skinned or left the factory Blank...hope they reconsider, and continue to slab BB's.