The book shows a nice Lyon 500, so rare that no machines had been offered for sale, so no value price is attatched.
Some of us followed an e-bay auction for one several years ago, that should have established what people are willing to pay. Also, one of our own members has aquired not 1 but 2 of these, his input would be valuable as well.
If one came up for sale locally I'm not sure how much I should pay in order to buy it right. On the other hand, neither does the new generation "picker" who has downloaded this app and many others into his e-book.
been