Seiko 5 Sports 6139-7020 Speed-Timer Chronograph
written by Mads – November 23, 2023
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A Collector’s Guide to the JDM “Flying Saucer”
Among the many references in the Seiko 6139 chronograph family, the 6139-7020 is one of the most distinctive. Collectors often refer to it as the “Flying Saucer” or “Apple”, a nickname inspired by its unusual case shape with crescent-style lugs and deep scoops around the bezel.
Unlike many other 6139 models that were produced for both domestic and international markets, the 6139-7020 was created exclusively for Japan. As a true JDM (Japan Domestic Market) model, it carries several small details that immediately set it apart from export references.
For many collectors, the watch represents one of the most interesting design experiments within the early Seiko automatic chronograph era.
Quick facts:
- Reference: Seiko 6139-7020
- Production: early 1970s
- Movement: Seiko 6139A or B automatic chronograph
- Jewels: 21J (JDM specification)
- Case Size: ~40 mm
- Lug Width: 19 mm
- Bracelet: XJA161 / XGA141
- Market: JDM only
Models and versions
The Seiko 5 Sports Speed-Timer 6139-7020 was released under a single reference number and remained a Japan-only model throughout its production.
Unlike other Seiko chronographs that often had export counterparts with slightly different dial codes or specifications, the 7020 stayed firmly within the Japanese catalog.
All examples share several consistent characteristics:
- 21-jewel movement
- English/Kanji day wheel
- Speed-Timer branding
If you encounter a watch that lacks these details, it may indicate replacement parts or modifications over the years.
This exclusivity is part of what makes the 6139-7020 particularly attractive for collectors today.
Dial variations
The Seiko 6139-7020 was produced with three dial variations, each with its own distinct personality.
Champagne Dial (7040T)
The champagne dial is perhaps the most elegant version. The warm metallic tone pairs beautifully with the unusual case design and creates a sophisticated yet sporty appearance.
Black Dial with Champagne Subdial (7040T)
This variant combines a black main dial with a champagne-colored chronograph register. The contrast gives the watch a distinctive visual depth and makes the subdial stand out strongly.
Black Dial with Black/Blue Subdial (7050T)
The final variant features a black dial with a dark blue-toned subdial, creating a more technical and tool-watch-like aesthetic.
There is little documented information about the relative rarity of these dial versions. For most collectors, the choice ultimately comes down to personal preference. From my perspective, the champagne dial remains the most visually appealing, followed closely by the black dial with champagne subdial.
