Metal fittings from old books are relatively common metal detecting finds!
Some early 17th century book fittings as the book binder intended! This book was bound, probably in Oxford, in around 1618-1620. The book has undoubtedly seen better days and the repair to the spine is really quite unfortunate.
One of the most touching things about books like this are the personal notes about births, deaths and notable incidents made by the owners. This one also contains the recipes for folk remedies to various ailments.