How it’s built
- Sale-to-sale steps: $510k to $550k (+7.8%) by December 2025, then $954,800 in February 2026 (+73.6%).
- 124 of 4,993 graded copies reached grade 10 (2.5%). 124 × $550k = $68.2m; at $954,800 it is $118.4m.
What we assumed
- The latest sale price applies to every grade-10 copy.This is Sports Illustrated’s own method; in reality selling many copies would move the price, so it overstates realisable value.
- Different copies sold at different venues are compared as one price path.No repeat-sales index exists for this card; the steps are indicative, not an index.
Sanity check
The population count comes from Sports Illustrated, not PSA’s report directly. A comparison with a Japanese edition crosses languages, so it is not a like-for-like premium.
Where it comes from
Our calculation from other figures in the trainer’s notes:
Show the working
- Step Dec2025 to Feb2026: 73.6%
- Step 2025 last to Dec2025: 7.8%
- PSA10 gem rate: 2.48%
- PSA10 pop: 124
- Graded total: 4,993
- PSA10 pop times Dec2025 price $: 68,200,000
- 954,800 / 550,000 − 1 = 73.6%
- 550,000 / 510,000 − 1 = 7.8%
- 124 / 4,993 = 2.48%
- 124 × 550,000 = 68,200,000 (matches SI's $68.2m,)
- 124 × 954,800 = 118,395,200
- 1,700,000 / 954,800 = 1.78
- 1,232,200 / 1,700,000 = 0.72