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Seiko - Seiko - "Slide Rule" Chronograph Automatic Watch -- 6138-7000 - Men - 1970-1979 in Netherlands
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Seiko 6138-7000 Slide Rule Chronograph for $1,553 for sale from a Private Seller on Chrono24
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Vintage Seiko Slide Rule Calculator Ref. No. 6138-7000 Chronograph Wrist Watch | eBay
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Seiko Rare Calculator Slide Rule Vintage Automatic Chronograph... for $2,545 for sale from a Trusted Seller on Chrono24
SEIKO CALCULATOR SLIDE RULE Vintage automatic chronograph watch Cal. 6138 Ref. 6138-7000 + BOX *** SPECTACULAR CONDITION *** Seiko Vintage watches - Watches83
Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979 in France
Seiko - “Calculator” Slide Rule Automatic Chronograph. 6138-7000 - 267434 - Men - 1970-1979 in Turkey
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Seiko Chronograph Rare Calculator Slide Rule Vintage Automatic... for $2,495 for sale from a Seller on Chrono24
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Seiko 6138-7000 slide rule | The Watch Bloke
NOS Unworn* Seiko Slide Rule 6138-7000 | Automatic Chronograph | 'Cal - The Time Curator
