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This Annex will help you further decode the information stamped in your watch's case, such as case serial numbers, and teach you how to deal with some anomolies that may be tripping you up.Now is a fantastic time to begin collecting Gruen watches.

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Curiously, the process for dating the earliest Gruen wristwatches -- from about 1915 to 1935 or so -- is probably the easiest because of the limited number of movements that Gruen had available, and the resulting relatively small number of specific models.The wonderful Gruen Guild Book that the company put out between 1929 and about 1931 (and widely available online) is arguably close to a "Masterbook" of Gruen watches, particularly wristwatches made up to that time period.So, here it is, the latest and greatest table: This table replaces the "Figure 2" in the article.Style Num Date0Download the Annex 1 to the Style Number Dating paper in PDF format.If you want to learn more about the application of Style Number Dating to help understand when each of Gruen's movements went into production and stopped being used in production, check out the analysis of in the Reference Section.

It's a visual view of each movement's use of Style Numbers. It shows how many Style Numbers were associated with Caliber 311 movements and what years those Style Numbers represent.

This version extends the Style Number dates back to 1925!

The online version (above) also provides dates for Style Numbers as far back as 1925.

This is the standard labor involved in collecting the basics.

It is from raw data such as this that patterns begun to emerge if you collect enough of it.

Case Manufacture Date - This date tells you when your specific watch's case was made.