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| Action Comics #400 | ||
| DC Comics, 5/71 | ||
| Leo Dorfman story | "Untold Tales of Kandor" story. | |
| Curt Swan and Murphy Anderson art | Supergirl and Brainiac appearance. | |
| Neal Adams and Dick Giordano cover | ||
| Books | CGC Label | CGC Total | Avg. Grade | 10 | 9.9 | 9.8 | 9.6 | 9.4 | 9.2 | 9.0 | 8.5 | 8.0 | 7.5 | 7.0 | 6.5 | 6.0 | 5.5 | 5.0 | 4.5 | 4.0 | 3.5 | 3.0 | 2.5 | 2.0 | 1.8 | 1.5 | 1.0 | 0.5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 BOOK | Universal | 91 | 8.26 | 0 0.00% | 0 0.00% | 3 3.3% | 14 18.7% | 13 33.0% | 9 42.9% | 9 53% | 12 66% | 7 74% | 3 77% | 5 82% | 5 88% | 3 91% | 3 95% | 1 96% | 2 98% | 0 98% | 1 99% | 0 99% | 0 99% | 0 99% | 0 99% | 1 100% | 0 100% | 0 100% |
| 1 BOOK | Signature | 11 | 6.96 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 1 9.1% | 1 18.2% | 0 18.2% | 0 18.2% | 2 36.4% | 0 36.4% | 0 36.4% | 5 82% | 0 82% | 0 82% | 1 91% | 1 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| 1 BOOK | Restored | 1 | 4.00 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 1 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| 1 BOOK | Qualified | 1 | 4.00 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 0 0.0% | 1 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| Action Comics #400 (1971, DC Comics) CGC Universal Grade Distribution | ||||||||||||||||||||||||
| 0% 0 10 | 0% 0 9.9 | 3% 3 9.8 | 15% 14 9.6 | 14% 13 9.4 | 10% 9 9.2 | 10% 9 9.0 | 13% 12 8.5 | 8% 7 8.0 | 3% 3 7.5 | 5% 5 7.0 | 5% 5 6.5 | 3% 3 6.0 | 3% 3 5.5 | 1% 1 5.0 | 2% 2 4.5 | 0% 0 4.0 | 1% 1 3.5 | 0% 0 3.0 | 0% 0 2.5 | 0% 0 2.0 | 0% 0 1.8 | 1% 1 1.5 | 0% 0 1.0 | 0% 0 0.5 |
| cgcdata.com, last updated September 16, 2025 | ||||||||||||||||||||||||