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  1. SEIKO 6139 movement with black column wheel

    THE JAPANESE WATCH DISCUSSION FORUM
    I was tinkering with my SEIKO 6139 and notice this unique black column wheel. Also found at least one other 6139 with the same black column wheel pic on Flikr. What do you think is the treatment and purpose? Looks like the kind of hardening found in tools. Please share your opinion. Thanks.
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