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1951 Bowman Mantle PSA 7(OC) on PWCC tonight
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01-17-2020, 12:50 PM
Goudey77
Martin
Martin L.ee
Join Date: Feb 2019
Location: Northwest
Posts: 429
I heard that the old slabs had some issues with their seals. So if you lived in a humid climate the cards could shrink up to %5
If you study paper fibers used in the 1950's you'd understand the risks involved with post war era cardboard.
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