A collection of jewellery reference books, to include Sir Charles Jackson - English Goldsmiths & Their Marks, Oppi Untracht - Jewelry Concepts & Technology, John Bowman & R Allen Hardy - The Jewelery Engravers Manual, Charles Jarvis - Jewellery Manufacture & Repair, 2 x Jan Divis - Guide to Gold Marks of the World & Silver Marks of the World, R Allen Hardy - The Jewelry Repair Manual,S F Myers & Co Manufacturing Jewelers reprinted catalogue No:22, E H Rutland - An Introduction to the World's Gemstones, David lewis - Practical Gem Testing and many others