Dating ru be somalidating
It's is also the most bullet-proof of the dating techniques.The tables have been shown to be very accurate, and unlike Style Number Dating, there are no caveats or tricky situations. Movement Manufacture Date - This tool is limited to the 405/410/420 family of movements. The reason it's an "iffy" kind of tool is that movements can be, and often have been, swapped out of the watch and a different movement installed.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.But from about the mid 1930s to 1958 (when Gruen ceased production of watches at their factory in Cincinnati), the number of movement calibers exploded, and the serializing of those movements took on byzantine characteristics that make Egyptian hieroglyphic look like a Kindergarten reading primer by comparison. But, ironically for some, it is a great source of fun and fascination, as the process of dating a given specimen often involves piecing nuggets of information together from far-flung resources.The chance to play the starring role in your own mini version of CSI (a popular crime show on the CBS Television Network in case you've been living in a cave for about the last decade or so) is irresistible to some.Yes, there are bits of information scattered here and there.
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.
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.
These and other brands have volumes of material and definitive movement serial number listings that allow for precise dating down to the year, and in some instances even the MONTH, in which a given specimen was manufactured.
Not so for Gruen, being the "orphan child" without a birth certificate because of a rather complicated method of serializing their movements, the records for which have been long lost, and most likely destroyed.
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Even if the movement is the exact same caliber as the original movement, it can have a manufacture date that differ by as much as 10 years. If it is close to the Case Manufacture Date and Style Number Date, then I feel quite satisfied with this estimate of the watch's age.