A lot of watch repair manuals from 75 years ago recommend benzene and cyanide for cleaning, and boxwood sawdust for drying. I wouldn't recommend any book that recommends these procedures. Watches have changed so much since many repair manuals were written, that they would be useless dealing with modern watches. If a person were interested in the repair of watches made when these books were written, they might be helpful. As long as one didn’t follow some of the procedures they recommend.
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