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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.
All of which has resulted in a greater refinement of the original "Cleves Chart." (And that effort continues.)The past two or three years have yielded more tools for collectors to work with, but the results of all these efforts have proven painstaking and piecemeal at best, as information and clues are scattered among a variety of paper publications and online resources, the latter of which must surely put the number of sources into the dozens if you count discussion websites.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.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.Should be no surprise that the graph shows the first Caliber 311 Style Numbers started in 1935 and they ended in 1937.There is precious little information "out there," unlike many other popular brands such Hamilton, Rolex, Omega, Elgin and others.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.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.