Interesting conversation. Is the assumption that slabs crack more than raw? If so, I wonder if that has anything to do with how slabs are sealed?
I'm putting together a Kelloggs run 1970-1983. I got my 1980-83 sets as a kid and I've been adding the 1970-79 sets over the past couple of years.
I place each card in a penny sleeve and then in a toploader. I haven't had any cracking across any of these.
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Working on the following sets: 1916 and 1917 Zeenut, 1955B, 1956T, 1965T, 1975T Mini
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