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I have seen the "swiss" only non chapter in watches from 870xxx through early 1.1 mil.
Having not owned one from new it is not a perfect science. I always thought that the 1.0 mil was the area of manufacture for swiss non chapter but with GMT cases at the end of the production cycle of gilts we tend to see mixed. Case backs sometimes tell more of a story than the mid case numbers. Just my personal observations. m
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