This is an item that is hard to put a price on. This is a hand bound, signed, Second Edition Porcelain Insulators Guidebook for Collectors. It was written and published by Jack H. Tod himself, the inventor of the U-numbering system. According to an Expert on the subject, there were not many of these Second Edition books published. This one was autographed by Jack H. Tod. I'll post 3 separate photos. I would like this book to go to someone who it would be meaningful to, I would be willing to trade this one book for other newer guidebooks or some nice porcelain insulators.