Two sites that are 100% Gruen and only Gruen....
http://www.GruenWristwatches.com - full of free material, research findings, galleries of Gruens, Gruen books, serial numbers, tutorials on dating, identifying Gruen watches, how to open a vintage watch case
http://www.VintageGruen.org - The only site 100% Gruen forums on the net. Reference information, many pictures and stats on individual watches, get help on identifying your Gruen from the experts
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