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Seiko

Seiko 5 Sports Speed-Timer 6138-0011 "UFO"

Seiko 5 Sports Speed-Timer 6138-0011 "UFO"

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Brand

seiko

Diameter

44mm

Model

Chronograph

Year

1970 - 1979

Reference

6138-0011

Water resistant?

No

Movement

Automatic

Case material

Steel

Specifications

Caliber 6138

Made in 1974

Approximate dimensions:

- 44mm (case without crown)

- 47mm (between claws)

- 19mm (bracelet fitting)

- 15mm (thickness)

Description

Vintage piece in excellent condition, showing small signs of use and time

Watch only, no original box or documentation

The wrist in the photo is approximately 17cm for reference

Learn more

Popularly known as the “UFO” due to its wide, rounded case, the Seiko 6138-0011 is one of those chronographs that perfectly embodies the boldness of the 1970s. A watch with a strong presence on the wrist, it has a futuristic look for its time that remains striking to this day.

Produced during a period when Seiko was solidifying its global reputation for innovation in mechanical watches, the model combines sporty design, robustness, and a great deal of personality. The 44mm case further reinforces this unique identity, which ultimately earned it the famous “UFO” nickname among collectors.

Inside is the legendary Seiko 6138 automatic caliber, an advanced movement for its time, equipped with a column-wheel chronograph and vertical clutch—technical solutions that are still highly respected in watchmaking today. It also offers a 30-minute and 12-hour stopwatch, as well as day and date displays, all with the reliability that made the 6138 line so highly regarded.

Today, the 6138-0011 is one of the most sought-after vintage Japanese chronographs among enthusiasts and collectors. More than just a beautiful and fun watch to wear on the wrist, it represents an important chapter in Seiko’s history and the rise of Japanese watchmaking on the global stage.

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Quality

We certify that all watches have been previously evaluated and tested by experienced watchmakers we trust. Therefore, all pieces advertised are authentic and in full working order.

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