Gruen watch repairer's reference / compiled by Mike Barnett.

Includes index.

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, et cetera 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.

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The book starts with a 26 page compilation of key data and facts by the author. The core of this section is a compact seven page movement interchangeability table (which is sorted numerically by Gruen caliber number), incorporating data on production dates, movement dimensions, and hand dimensions. Various lists and tables on mainsprings, crows, hand and interchangeable complete balances take up the next 19 pages. Most of the data comes from original Gruen publications, some from third parties, such as the watch part wholesaler Swartchild.The bulk of the book (pages 27 to 771) is made up of facsimile reproductions of seven different Gruen spare parts catalogues (plus three supplements) dating from 1921, 1926, 1939, 1945, 1948 and 1953. Not being a Gruen expert myself I do not know how representative that list is of all parts catalogues ever produced by Gruen, but given that at the time of Gruen calibers had a much longer lifetime than is true today, I would assume that there are few -if any - calibers that are not covered in the lineup.The short final section of the book (pages 472 to 503) reproduces three additional, undated documents relating to Gruen parts: a- A seven page illustrated caliber identification chart of Gruen watches from an Swartchild catalog, b- A 'Gruen Crystal Chart", 24 pages, published by Gruen itself, and c- The Gruen page from a C-S Flexo watch crystal catalog, relating Gruen case numbers to C-S Crystal stock numbers.