"July 9th 1897", bearing seven perforated colour trials, each with duty tablets, in seven different colours representing possible alternatives to those of Appendix "A"; attractive and extremely rare. Photo" /> Proof "Appendix B", dated<I> "July 9th 1897"</I>, bearing seven perforated colour trials, each with duty tablets, in seven different colours representing possible alternatives to those of Appendix "A"; attractive and extremely rare. Photo | Christie's