Rare Vintage Seiko 6138-7000 "Slide Rule Calculator" Chronograph Automatic Men's Watch, Men's Fashion, Watches & Accessories, Watches on Carousell
![Lot-Art | Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979 Lot-Art | Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979](https://static2.lot-art.com/public/upl/57/Seiko-Calculator-Slide-Rule-Huge-Double-Chronograph-Cal6138-6138-7000-Men-1970-1979_1599317820_3166.jpg)
Lot-Art | Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979
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