This large book has page after page of photographs of the Art Deco jewellery of the 1920s and 1930s from Bengel. Because at the onset of WW2 many Jewish workers downed tools and never returned. The factory retained its history, unfinished and finished jewellery with many order and pattern books, allowing identification and dates of manufacture.
For an introduction to Jakob Bengel's jewellery this book is invaluable. However the translation of German to English and the fact that half the book is in German and the other half the English translation makes the first few pages hard to read. But get past that and the full colour photographs are well worth it.
This is not the only book available on this subject but a worthy one to have in your collection.