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Post by marsss25 on Sept 29, 2020 0:07:07 GMT
This 2012 article by Mike Barnett and Barry Cooper was a nice revalation for dating Gruen watches. Since they carried no date codes such as those used by Bulova, someone pieced together this research. As they say in the paper, the research is not perfect, but it is quite an interesting read. Revolutionary New Gruen Dating Technique
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