The Gruen Watch Repairer's Reference

An enormous compilation of Gruen reference material that can be used by any Gruen collector or Gruen watch restorer. Contains all 4 of the main Gruen Material Catalogs along with very rare versions from 1921, 1926, supplements, etc. All of the Gruen published material information is contained in this book. This reference is a must for Gruen restorers and collectors interested in learning more about the movements and inner workings of Gruen watches.