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Rare Vintage Seiko 6138-7000 "Slide Rule Calculator" Chronograph Automatic Men's Watch, Men's Fashion, Watches & Accessories, Watches on Carousell
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![6138-7000 ] April 1973 slide rule : r/Seiko](https://preview.redd.it/6138-7000-april-1973-slide-rule-v0-wod4red2flf81.jpg?width=3024&format=pjpg&auto=webp&s=9812b434aece3ce1cce6790b1e647578367f47f6 "6138-7000 ] April 1973 slide rule : r/Seiko")
6138-7000 ] April 1973 slide rule : r/Seiko
![6138-7000 ] April 1973 slide rule : r/Seiko](https://i.redd.it/6138-7000-april-1973-slide-rule-v0-pmudkui2flf81.jpg?width=3024&format=pjpg&auto=webp&s=fae1221d53dfc3168c1c0a6abc539beab2660464 "6138-7000 ] April 1973 slide rule : r/Seiko")
6138-7000 ] April 1973 slide rule : r/Seiko
How to use a slide rule bezel
Vintage SEIKO 6138-7000 Slide Rule Chronograph Automatic Cal 6138B – 44 mm – St. John's Institute (Hua Ming)
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Slide Rule Calculator ' - Seiko Ufo Ref'7000 - Automatic Chronograph Cal'6138 Japan - Good Vintage Condition - Good Working - Circa Juni… | Instagram
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Seiko - Calculator "Slide Rule" Bilingual Chronograph - 6138-7000 - Men - 1970-1979 - Catawiki
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Vintage Seiko Slide Rule Calculator Ref. No. 6138-7000 Chronograph Wrist Watch | eBay
