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Lot-Art | Seiko - "Calculator" Slide Rule Huge Double Chronograph Cal.6138 - 6138-7000 - Men - 1970-1979
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![WTS] Seiko Chronograph "Engineer Sliderule" : r/Watchexchange](https://preview.redd.it/meekop7tkyp81.jpg?width=640&crop=smart&auto=webp&s=fc2d01a562960021ff0358a1fb1f07ec18e679f8 "WTS] Seiko Chronograph \"Engineer Sliderule\" : r/Watchexchange")
WTS] Seiko Chronograph "Engineer Sliderule" : r/Watchexchange
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Seiko Men's SND255P1 Flightmaster Pilot Slide Rule Chronograph Watch
Lot-Art | Seiko - “Calculator” Slide Rule Automatic Chronograph. 6138-7000 - 267434 - Men - 1970-1979
