Description
Vintage Seiko Slide Rule Calculator Chronograph | Ref. 6138-7000 | Caliber 6138 | Automatic | 1970s
A rare and highly sought-after vintage Seiko Slide Rule Calculator Chronograph, Reference 6138-7000 — one of the most iconic and technically fascinating Japanese watches of the 1970s. Powered by the legendary in-house Seiko Caliber 6138 automatic chronograph movement, this remarkable timepiece combines full chronograph functionality with a working slide rule double bezel calculator — allowing the wearer to perform mathematical equations directly on the wrist. Day and date display in English adds everyday practicality to this already impressive complication package. The stainless steel case presents in great overall condition with an original clean dial — a critical factor for collectors, as unrestored examples with honest original dials command significant premium. The 6138-7000 Slide Rule represents Seiko at its most innovative and ambitious — a true tool watch ahead of its time and a cornerstone piece of any serious vintage Seiko or Japanese watch collection.
Product Info:
Brand: Seiko
Model: Slide Rule Calculator
Case Material: Steel
Model/Ref: 6138-7000
Case No: 285335
Movement: Automatic
Caliber: 6138B
Diameter without crown: 44 mm
Diameter with crown: 46 mm
Inside Lug Width: 19 mm
Lug to Lug: 47 mm
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