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| X-Men #20 | ||
| Marvel Comics, 5/66 | ||
| Roy Thomas story | Lucifer, Blob and Unus appearance. | |
| Werner Roth and Dick Ayers art | Letter from Frank Brunner. | |
| Kirby, Roth and Ayers 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 | 1,057 | 6.87 | 0 0.00% | 0 0.00% | 3 0.3% | 18 2.0% | 40 5.8% | 48 10.3% | 83 18.2% | 93 27.0% | 111 37.5% | 118 48.6% | 94 58% | 95 67% | 74 74% | 62 79% | 60 85% | 50 90% | 39 93% | 22 96% | 21 98% | 13 99% | 7 99% | 2 100% | 0 100% | 2 100% | 2 100% |
| 1 BOOK | Signature | 52 | 5.98 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 1 1.9% | 0 1.9% | 2 5.8% | 4 13.5% | 4 21.2% | 1 23.1% | 4 30.8% | 7 44.2% | 8 60% | 4 67% | 3 73% | 4 81% | 3 87% | 4 94% | 0 94% | 3 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| 1 BOOK | Restored | 23 | 7.33 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 2 8.7% | 2 17.4% | 2 26.1% | 2 34.8% | 3 47.8% | 1 52% | 3 65% | 3 78% | 1 83% | 1 87% | 1 91% | 1 96% | 0 96% | 1 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| 1 BOOK | Qualified | 7 | 6.10 | 0 0.00% | 0 0.00% | 0 0.0% | 0 0.0% | 0 0.0% | 1 14.3% | 0 14.3% | 0 14.3% | 0 14.3% | 1 28.6% | 0 28.6% | 0 28.6% | 1 42.9% | 1 57% | 2 86% | 1 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% | 0 100% |
| X-Men #20 (1966, Marvel Comics) CGC Universal Grade Distribution | ||||||||||||||||||||||||
| 0% 0 10 | 0% 0 9.9 | 0% 3 9.8 | 2% 18 9.6 | 4% 40 9.4 | 5% 48 9.2 | 8% 83 9.0 | 9% 93 8.5 | 11% 111 8.0 | 11% 118 7.5 | 9% 94 7.0 | 9% 95 6.5 | 7% 74 6.0 | 6% 62 5.5 | 6% 60 5.0 | 5% 50 4.5 | 4% 39 4.0 | 2% 22 3.5 | 2% 21 3.0 | 1% 13 2.5 | 1% 7 2.0 | 0% 2 1.8 | 0% 0 1.5 | 0% 2 1.0 | 0% 2 0.5 |
| cgcdata.com, last updated September 16, 2025 | ||||||||||||||||||||||||