I don't agree with the last review. This book has to be viewed as a complement, a second volume, to Practical Watch Repairing of the same author. You have to read the first book to fully understand it. If you look at this book as a second volume of the classic Practical Watch Repairing, it deserves 4 stars. It does not cover new automatic movements from the 70s and 80s, but every automatic system used by the industry is documented. Well, if you can repair an ETA or Omega from the 50s or 60s, you can repair a movement from the 80s and 90s. That's my point of view.