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Seiko

Top view of the 1977 Seiko 7009-8100 associated with a catalogued plus three seconds per day rate

Vintage Seiko Accuracy Explained: What Is Normal?

Top view of the 1977 Seiko 7009-8100 associated with a catalogued plus three seconds per day rate
amplitude

Vintage Seiko Accuracy Explained: What Is Normal?

What vintage Seiko accuracy numbers mean, how to measure the real daily rate and why one timegrapher figure is not a long-term guarantee.

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