Every graded card in every Topps Black & White baseball release, across three grading companies. The headline rate is the share of submissions that came back at a 10-level grade — the only measure the three scales share.
The scales are not equivalent. PSA tops out at a single 10. CGC splits its 10 three ways (Gem Mint, Pristine, Perfect). BGS reserves 10 for Pristine and Black Label and markets 9.5 as its Gem Mint — so comparing BGS's 10 rate against PSA's understates BGS badly. Use the Gem+ column, which adds BGS 9.5, for the grade collectors actually call gem. Every tier is spelled out per row.
SGC is not covered: its population report sits behind a reCAPTCHA and cannot be collected automatically.
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