*NOS Unworn* Seiko Slide Rule 6138-7000 | Automatic Chronograph | 'Calculator'

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We are proud to offer this fantastic piece that remained practically untouched for the last  50 years.

A real collector's item, not only for its condition but for the rarity of this reference, it was designed for those who wanted a slide rule on their wrist for conducting mathematical calculations. Its “Calculator” denomination refers to the slide rule double bezel that can be used to complete any number of mathematical equations on the fly.

The 7000 is easily one of the rarest and most sought-after 6138s available.



New Old Stock / Unworn, with original tags and stickers, a truly Museum quality item.

The colors are crisp, the case and bracelet are free of noticeable scratches.

The watch is in full working condition and accuracy is as expected for a watch of its age.



Maker: Seiko
Model: Chronograph Slide Rule
Reference: 6138-7000
Year: 1970s
Material: Stainless steel 
Dimensions: 44mm diameter
Crystal: Plexiglass 
Lume: Yes, Tritium
Caliber: 6138B - 21 Jewels -
Bracelet/Strap: Original Seiko bracelet
Lug width: 19mm 
Box/Papers: Original box and outer box


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