Of course everything depends on the "Overall" condition of the book, however... FN 6.0 can have up to a 1/4" spine split, no interior tears permitted. VG/FN 5.0 can have up to a 1/2" spine split, minor interior tales may be present. VG 4.0 can have up to a 1" spine split, minor to moderate interior tears may be present. GD/VG 3.0 can have a spine split from 1" - 1 1/2", minor to moderate interior tears may be present. GD 2.0 can have a spine split up to 2", moderate inte