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A highly coveted and historically significant timepiece from the revolutionary Japanese brand Seiko, this 6139-6010 "Proof Dial" model showcases one of the world's first automatic chronograph movements. This specific early-production variant features the extremely rare "Water Proof" designation on the unique chocolate brown dial—a collector detail often referred to as the "Pogue" model's precursor—blending rugged functionality with a distinctive aesthetic — ideal for enthusiasts of early automatic chronographs and immaculate vintage Japanese horology.

Details:

• Brand: Seiko

• Model: 6139-6010 ("Proof/Proof" Chocolate Dial)

• Movement: Automatic Seiko Calibre 6139 – Column wheel chronograph

• Case: Stainless steel, robust shape

• Case size (approx.): 40mm diameter (excluding crown)

• Dial: Deep brown/chocolate, single minute-register subdial, and yellow inner rotating tachymeter scale. Early "Water Proof" text on the dial.

• Crystal: Hardlex (original style)

• Strap: Leather strap 

• Case back: Stainless steel, marked with the early "Water Proof" stamp and model reference

• Condition: Very good vintage condition with honest signs of use. Movement runs well, and the quick-set day/date function and chronograph operate as expected.

This Seiko 6139-6010 Proof Dial represents the very best of early automatic chronograph production, being part of the trio that launched this technology globally. It is a functional, iconic, and highly collectible piece for enthusiasts or those seeking a legendary vintage sports watch with significant heritage and a unique color profile.