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The surprising next move Seiko made was to put these individually certified calibers into commercially available production watches marked as certified chronometers. The first batch of 73 link watches released in 1969 used the specifically regulated Cal. 4520 as-is, and the follow-up pieces carried the link Cal. 4580 designation. Lot 40 is one of link the Cal. 4580 watches released in 1970.
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