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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.The Style Number Dating Table has been extended back as far as it will go, which seems to be 1925.Last year this table was incorporated into the Online Style Number Tool and the Windows software version 4.0, but the table itself wasn't published.Date your Gruen using Style Numbers, described in the article below.Enter your Style Number in the box below to find your watch's date and additional Style Number information.You want to match the date with the correct use of that date.Here are the 3 different dates that can be found on a Gruen watch.2.

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It's important to understand the difference between the dates that these tools provide.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.Should be no surprise that the graph shows the first Caliber 311 Style Numbers started in 1935 and they ended in 1937.