Group lot of 65 issues: #542-602, 605-607 (1997-2002); 1st Cassandra Cain, 2nd Harley Quinn; avg. grade: 9.4; estimated value: $450+Group lot of 65 issues includes 1st appearance of Cameron Chase (#550), iconic Joker covery J. Scott Campbell (#563), 1st appearance and cover of Cassandra Cain, later becomes Batgirl, Orphan II and the Black Bat (#567) and 2nd appearance of Harley Quinn in the main DC comic book storytelling universe (#570); two copies of #550 (regular & collectors edition).