If you have a lot of Perthshire paperweights to ID, I recommend you find a copy of the book on Perthshire. The Complete Guide to Perthshire Paperweights by Colin Mahoney, Gary McClanahan, Marge McClanahan & Debby Mahoney. Make sure you are buying the book published in 1997. There is a later version published in 2015 that mostly covers the later years and not the earlier ones. Amazon listings are very messed up and it is hard to tell what you are buying, so be careful.