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Seiko CALCULATOR SLIDE RULE Vintage automatic chronograph... for $2,834 for sale from a Trusted Seller on Chrono24
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Seiko Rare Calculator Slide Rule Vintage Automatic Chronograph... for $2,515 for sale from a Trusted Seller on Chrono24
![Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979 at auction | LOT-ART Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979 at auction | LOT-ART](https://gcp-la8-storage-cdn.lot-art.com/public/upl/57/Seiko-Calculator-Slide-Rule-Huge-Double-Chronograph-Cal6138-6138-7000-Men-1970-1979_1599317820_3166.jpg)
Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979 at auction | LOT-ART
![SEIKO CALCULATOR SLIDE RULE 1976 Vintage automatic chronograph watch Cal. 6138 Ref. 6138-7000 *** BEAUTIFUL *** Seiko Vintage watches - Watches83 SEIKO CALCULATOR SLIDE RULE 1976 Vintage automatic chronograph watch Cal. 6138 Ref. 6138-7000 *** BEAUTIFUL *** Seiko Vintage watches - Watches83](https://watches83.com/71026-thickbox_default/seiko-calculator-slide-rule-1976-vintage-automatic-chronograph-watch-cal-6138-ref-6138-7000-beautiful-.jpg)