Seiko 6139-600X has two claims to fame. In 1969, Seiko introduced what was arguably the world’s first automatic chronograph, the Seiko 6139. And the -600X was the first chronograph worn in space. Col. Pogue wore a 6139-6002 during the NASA Skylab 4 mission which took place in 1973.
Another distinguishing feature of this watch is the bold red and blue outer bezel, affectionately referred to as the "Pepsi" bezel.
There are 3 dial colors for this watch series: yellow, blue, and silver. The silver dial is by far the rarest. There are also 2 variations of the dial depending on whether this watch was available within the Japanese market or worldwide. The watch on this listing is the JDM (Japanese Domestic Market) model, and was released only within Japan back then.
Note: being a 40+ years old vintage watch, not all parts are original anymore. We are selling this watch "as is". If you require 100% original parts, this is not it.
Caseback Serial: 6D2777
Year: December 1976
Dial: Silver dial with red and blue "Pepsi" bezel
Movement: Automatic Chronograph
Case: Stainless steel
Case diameter: 41mm (excludes crown)
Lug to lug: 46mm
Case thickness: 14mm
Caseback: Seiko caseback
Band: Seiko original bracelet fitting up to 17cm
Box & papers: No longer available
Warranty: 12 months in-house warranty