My guess is that modern BVG would average 1-2 grades lower than SGC, but it could depend. Some older BVG slabs weren't all bad. In about 2000 - 2002 when Beckett briefly did subgrades with vintage - those grades were very accurate, IMO.
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Postwar stars & HOF'ers. Cubs of all eras. Currently working on 1956, '63 and '72 Topps complete sets.
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