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Amazon.com: 316L Stainless Steel Sapphire Crystal Transparent Watch Case Back Cover Fit for Seiko Samurai SKX007 SKX009 SKX013 SKX7002 6105 NH35 NH36 Movement, Silver/transparent, 33mm, C-001 : Clothing, Shoes & Jewelry
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Harry's Vintage Seiko Blog: A short ramble on the caseback transformation of a 1964 Grand Seiko Chronometer
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