Yep, if there was ever a card that shouldn't be constrained in the slab it's the 3-d cards. Archivally there's so much going on there that really isn't precisely understood. I have 3-d stuff that's older than the Kelloggs, probably mid 1960's, that's barely warped. And I have later Kelloggs from the 80's that are quote warped. So much for keeping the mail in set in 4 card panels as it was shipped to me! 10 years on they curled and became singles.
I do have a few 70's 3-d cards in screwdowns that are still uncracked and flat. But if I take them out I'll be very nervous.
I also have had concerns about slabbing cards made on acidic cardboard. While most T cards seem to have been low acid board the strip cards and most 50's Topps seem like they could be at risk. as the cardboard breaks down it releases acid, and if it's kept airtight that acid can't evaporate and does more damage. I'd love to have the big 3 companies slab a card along with a bit of test paper to see what happens. But I doubt I'd have any takers. If it goes like I think it might it would be a huge hit to the business, and it would mean that we've already damaged the very best cards of 2-3 eras. (20's, 50's, and 70's)
Steve B
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