A PSA 9 with a 10/10 centering sub-grade can be worth 3-5x a “regular” PSA 9. The difference between a card that hammers at $5,000 and one that hammers at $50,000 is often a single sub-grade. Here’s exactly how grading services see your card.
The Four Sub-Grades Explained
- Centering — front and back. Measured by the ratio of border widths. PSA’s “10” centering is typically 55/45 or better front, 75/25 or better back.
- Corners — sharpness, color, and absence of fraying. Even minor whitening drops a corner to 9 or below.
- Edges — looking down all four edges for dings, layer separation, or whitening.
- Surface — print marks, scratches, indentations, focus, and gloss.
How Grades Combine
The overall grade is generally the lowest of the four sub-grades, but with allowances. A card with three 10s and one 9 will usually qualify for an overall 10. Two 9s and two 10s can still net a 10 in some submissions. PSA, BGS, and CGC all weight subtly differently.
The Centering Math
Pre-1980 cards: 70/30 or better is genuinely rare. 1980-1995: 65/35. 1995+: 60/40. Modern foils: 55/45. The centering rate of mint-quality cards in any pre-1990s set is shockingly low — often under 1% of all cards printed.
What Catches Most Submissions
- Soft corners on cards stored in penny sleeves without top-loaders.
- Print lines — diagonal print defects baked into the original press run. These can’t be fixed.
- Edge whitening from being shuffled into stacks.
- Surface scratches that only show under angled bright light.
- Minor wax stains from original packs (sometimes acceptable, sometimes not).
Pre-Submission Inspection (10-Minute Routine)
- Bright LED lamp at an angle, 12 inches from card.
- Loupe or 10x magnifier — examine all four corners.
- Run finger along edge — feel for nicks invisible under light.
- Hold card flat at eye level — check warping or bending.
- Measure border ratios with a transparent ruler.
- Photograph in 4 angles for your submission record.
When NOT to Submit
If your honest pre-grade is below the population’s median — and the card’s value gap between grades is small — you’re paying $20-50 to confirm what you already knew. Submit only when you believe the card will grade at or above the value-cliff threshold for that issue.
The Population Report Lever
PSA, BGS, and CGC publish population reports. Cards with extreme rarity at top grades (Pop 1, Pop 5, Pop 10) command outsized premiums. Knowing the pop report before submitting helps you decide whether the marginal value exceeds the marginal cost.
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Frequently Asked Questions
What are sub-grades in card grading?
Sub-grades are individual scores (1-10) assigned to four specific aspects of a card: centering, corners, edges, and surface. The overall grade reflects the lowest sub-grade. PSA introduced visible sub-grades on PSA 8.5 and below; SGC and CGC display sub-grades on all grades. BGS prominently displays all four.
How much do sub-grades affect card value?
Significantly. A BGS 9.5 with all 9.5+ sub-grades (“Pristine”) trades 2-10x higher than a standard BGS 9.5. A PSA 10 with 10/10/10/10 sub-grades commands 30-300% premiums on key vintage cards. Black Label BGS 10 cards (all 10s) can sell for 50x a regular BGS 10.
Why does centering matter so much?
Centering is purely a manufacturing variable beyond a collector’s control, making perfectly centered cards rare from any print run. PSA requires 55/45 or better for Gem Mint 10. A 1980s rookie card off-center 70/30 may grade only PSA 7 even with mint corners and edges, sometimes losing 90% of value.
Can sub-grades be improved by re-grading?
No. Sub-grades reflect inherent card characteristics that cannot change. However, re-submission can occasionally yield half-grade improvements due to grader variation. Cracking and resubmitting is risky: damage during cracking is common and typically lowers grades.
Are sub-grades the same across grading companies?
No. PSA, BGS, SGC, and CGC use different criteria and tolerances. BGS is generally the strictest on centering; PSA tends toward stricter surface evaluation. A card scoring 9.5 sub-grades across the board at one company may receive different scores elsewhere.