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  1. Differences between 6139 7100 & 7101

    THE JAPANESE WATCH DISCUSSION FORUM
    I've recently come into possession of two good examples of the Seiko 'White Helmet'. The first is dated December 1975, reference 7100. The second is dated September 1978, reference 7101. It took me a little while to spot them, but there are differences between the two cases: 1. On the 7100...
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