Book excerpt: Guides collectors, restorers and enthusiasts through the various production changes and problem areas that occur between the various models, to make sure that the restoration or prospective purchase is correct, original, and legitimate. This book is an essential reference tool that can be used when buying, selling, repairing or restoring the various D-models manufactured between 1966 and 1975. One hundred colour photos, useful appendices and expert advice mean that this book could save you thousands!