As far as i'm aware there are no Palitoy proof cards known but these unused cardbacks are about as close as it gets. These samples were obtained from a lithographic printing firm in Northampton that supplied Palitoy, German General Mills and Dutch Clipper cardbacks to the Palitoy factory in Coalville where they were assembled. They appear to be of a thinner card stock and texture to the standard printed cards. As far as i'm aware these are the only unused ESB Palitoy cardbacks to be found. Anyway I hope you enjoy the pictures that i finally got around to taking.