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Detective Comics #421
DC Comics, 3/72
Frank Robbins storyBatgirl backup story.
Frank Robbins and Don Heck art
Neal Adams and Alan Kupperberg cover
 BooksCGC LabelCGC TotalAvg. GradeCensus Date109.99.89.69.49.29.08.58.07.57.06.56.05.55.04.54.03.53.02.52.01.81.51.00.5
 1. Detective Comics 421 (3/72, DC Comics)Universal28.85 July 01, 2001 11
 2. Detective Comics 421 (3/72, DC Comics)Universal59.22 January 27, 2002 1121
 3. Detective Comics 421 (3/72, DC Comics)Universal119.14 July 17, 2003 143111
 4. Detective Comics 421 (3/72, DC Comics)Universal169.23 January 08, 2004 1353211
 5. Detective Comics 421 (3/72, DC Comics)Universal169.23 July 12, 2004 1353211
 6. Detective Comics 421 (3/72, DC Comics)Universal209.29 December 16, 2004 1573211
 7. Detective Comics 421 (3/72, DC Comics)Universal249.30 July 07, 2005 1694211
 8. Detective Comics 421 (3/72, DC Comics)Universal269.32 January 27, 2006 2695211
 9. Detective Comics 421 (3/72, DC Comics)Universal299.33 June 20, 2006 27106211
 10. Detective Comics 421 (3/72, DC Comics)Universal309.33 January 10, 2007 27116211
 11. Detective Comics 421 (3/72, DC Comics)Universal339.34 July 05, 2007 29117211
 12. Detective Comics 421 (3/72, DC Comics)Universal369.35 January 09, 2008 211118211
 13. Detective Comics 421 (3/72, DC Comics)Universal409.35 July 01, 2008 311128411
 14. Detective Comics 421 (3/72, DC Comics)Universal419.35 January 13, 2009 311138411
 15. Detective Comics 421 (3/72, DC Comics)Universal419.35 June 24, 2009 311138411
 16. Detective Comics 421 (3/72, DC Comics)Universal429.36 December 15, 2009 411138411
 17. Detective Comics 421 (3/72, DC Comics)Universal459.34 June 14, 2010 413138412
 18. Detective Comics 421 (3/72, DC Comics)Universal479.34 December 27, 2010 513138512
 19. Detective Comics 421 (3/72, DC Comics)Universal509.35 June 27, 2011 515139512
 BooksCGC LabelCGC TotalAvg. GradeCensus Date109.99.89.69.49.29.08.58.07.57.06.56.05.55.04.54.03.53.02.52.01.81.51.00.5
 20. Detective Comics 421 (3/72, DC Comics)Universal559.36 January 02, 2012 6161510512
 21. Detective Comics 421 (3/72, DC Comics)Universal579.37 July 02, 2012 6171610512
 22. Detective Comics 421 (3/72, DC Comics)Universal609.36 December 31, 2012 7171710522
 23. Detective Comics 421 (3/72, DC Comics)Universal689.33 June 22, 2013 7191911552
 24. Detective Comics 421 (3/72, DC Comics)Universal719.34 December 31, 2013 8201912552
 25. Detective Comics 421 (3/72, DC Comics)Universal739.35 July 01, 2014 9211912552
 26. Detective Comics 421 (3/72, DC Comics)Universal749.34 December 30, 2014 9211912652
 27. Detective Comics 421 (3/72, DC Comics)Universal779.34 June 30, 2015 9212014652
 28. Detective Comics 421 (3/72, DC Comics)Universal799.34 December 29, 2015 9222014752
 29. Detective Comics 421 (3/72, DC Comics)Universal799.34 June 28, 2016 9222014752
 30. Detective Comics 421 (3/72, DC Comics)Universal809.28 December 27, 2016 92220147521
 31. Detective Comics 421 (3/72, DC Comics)Universal849.26 June 27, 2017 922221485211
 32. Detective Comics 421 (3/72, DC Comics)Universal919.18 January 02, 2018 9242314962112
 33. Detective Comics 421 (3/72, DC Comics)Universal929.18 July 03, 2018 92423141062112
 34. Detective Comics 421 (3/72, DC Comics)Universal939.18 January 01, 2019 92423151062112
 35. Detective Comics 421 (3/72, DC Comics)Universal989.14 July 02, 2019 92425161072122
 36. Detective Comics 421 (3/72, DC Comics)Universal1039.13 December 31, 2019 1026261610721122
 37. Detective Comics 421 (3/72, DC Comics)Universal1059.10 June 30, 2020 10262616107221122
 38. Detective Comics 421 (3/72, DC Comics)Universal1089.07 December 29, 2020 10252716127222122
 39. Detective Comics 421 (3/72, DC Comics)Universal1129.06 June 29, 2021 10272716128222222
 BooksCGC LabelCGC TotalAvg. GradeCensus Date109.99.89.69.49.29.08.58.07.57.06.56.05.55.04.54.03.53.02.52.01.81.51.00.5
 40. Detective Comics 421 (3/72, DC Comics)Universal1149.04 December 28, 2021 10272816128232222
 41. Detective Comics 421 (3/72, DC Comics)Universal1169.05 June 28, 2022 10282816138232222
 42. Detective Comics 421 (3/72, DC Comics)Universal1209.04 December 27, 2022 10292815159332222
 43. Detective Comics 421 (3/72, DC Comics)Universal1249.05 June 27, 2023 11292916169332222
 44. Detective Comics 421 (3/72, DC Comics)Universal1298.94 December 31, 2023 1229291616943222122
 45. Detective Comics 421 (3/72, DC Comics)Universal1498.91 June 24, 2025 14313117181384333121
 46. Detective Comics 421 (3/72, DC Comics)Universal1508.88 July 01, 2025 14313117181384333131
 47. Detective Comics 421 (3/72, DC Comics)Universal1508.88 July 15, 2025 14313117181384333131
 48. Detective Comics 421 (3/72, DC Comics)Universal1518.87 July 22, 2025 14313117181394333131
 49. Detective Comics 421 (3/72, DC Comics)Universal1518.87 July 29, 2025 14313117181394333131
 50. Detective Comics 421 (3/72, DC Comics)Universal1518.87 August 05, 2025 14313117181394333131
 51. Detective Comics 421 (3/72, DC Comics)Universal1518.87 August 12, 2025 14313117181394333131
 52. Detective Comics 421 (3/72, DC Comics)Universal1518.87 August 19, 2025 14313117181394333131
 53. Detective Comics 421 (3/72, DC Comics)Signature19.20 December 27, 2010 1
 54. Detective Comics 421 (3/72, DC Comics)Signature19.20 June 27, 2011 1
 55. Detective Comics 421 (3/72, DC Comics)Signature19.20 January 02, 2012 1
 56. Detective Comics 421 (3/72, DC Comics)Signature29.10 July 02, 2012 11
 57. Detective Comics 421 (3/72, DC Comics)Signature29.10 December 31, 2012 11
 58. Detective Comics 421 (3/72, DC Comics)Signature39.13 June 22, 2013 21
 59. Detective Comics 421 (3/72, DC Comics)Signature49.10 December 31, 2013 22
 BooksCGC LabelCGC TotalAvg. GradeCensus Date109.99.89.69.49.29.08.58.07.57.06.56.05.55.04.54.03.53.02.52.01.81.51.00.5
 60. Detective Comics 421 (3/72, DC Comics)Signature49.10 July 01, 2014 22
 61. Detective Comics 421 (3/72, DC Comics)Signature59.20 December 30, 2014 122
 62. Detective Comics 421 (3/72, DC Comics)Signature59.20 June 30, 2015 122
 63. Detective Comics 421 (3/72, DC Comics)Signature59.20 December 29, 2015 122
 64. Detective Comics 421 (3/72, DC Comics)Signature59.20 June 28, 2016 122
 65. Detective Comics 421 (3/72, DC Comics)Signature79.07 December 27, 2016 1231
 66. Detective Comics 421 (3/72, DC Comics)Signature79.07 June 27, 2017 1231
 67. Detective Comics 421 (3/72, DC Comics)Signature79.07 January 02, 2018 1231
 68. Detective Comics 421 (3/72, DC Comics)Signature99.02 July 03, 2018 1332
 69. Detective Comics 421 (3/72, DC Comics)Signature99.02 January 01, 2019 1332
 70. Detective Comics 421 (3/72, DC Comics)Signature109.08 July 02, 2019 2332
 71. Detective Comics 421 (3/72, DC Comics)Signature128.90 December 31, 2019 23322
 72. Detective Comics 421 (3/72, DC Comics)Signature138.75 June 30, 2020 233221
 73. Detective Comics 421 (3/72, DC Comics)Signature138.75 December 29, 2020 233221
 74. Detective Comics 421 (3/72, DC Comics)Signature138.75 June 29, 2021 233221
 75. Detective Comics 421 (3/72, DC Comics)Signature138.75 December 28, 2021 233221
 76. Detective Comics 421 (3/72, DC Comics)Signature138.75 June 28, 2022 233221
 77. Detective Comics 421 (3/72, DC Comics)Signature148.81 December 27, 2022 333221
 78. Detective Comics 421 (3/72, DC Comics)Signature148.81 June 27, 2023 333221
 79. Detective Comics 421 (3/72, DC Comics)Signature148.81 December 31, 2023 333221
 BooksCGC LabelCGC TotalAvg. GradeCensus Date109.99.89.69.49.29.08.58.07.57.06.56.05.55.04.54.03.53.02.52.01.81.51.00.5
 80. Detective Comics 421 (3/72, DC Comics)Signature168.37 June 24, 2025 33322111
 81. Detective Comics 421 (3/72, DC Comics)Signature168.37 July 01, 2025 33322111
 82. Detective Comics 421 (3/72, DC Comics)Signature168.37 July 15, 2025 33322111
 83. Detective Comics 421 (3/72, DC Comics)Signature168.37 July 22, 2025 33322111
 84. Detective Comics 421 (3/72, DC Comics)Signature168.37 July 29, 2025 33322111
 85. Detective Comics 421 (3/72, DC Comics)Signature168.37 August 05, 2025 33322111
 86. Detective Comics 421 (3/72, DC Comics)Signature168.37 August 12, 2025 33322111
 87. Detective Comics 421 (3/72, DC Comics)Signature168.37 August 19, 2025 33322111

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