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SOLD - Seiko Speedtimer Bullhead 6138-0040





The Seiko 6138 is the second iteration following the 6139, introducing several enhancements not found in its predecessor.


One notable addition is the inclusion of a 12-hour register for the chronograph, allowing for more comprehensive timekeeping. Furthermore, the 6138 can now be manually wound using the crown, and the day and date can be independently set with greater convenience. The name "bullhead" was given to this model due to Seiko's decision to rotate the movement within the case by 90 degrees, positioning the crown and chronograph pushers at the top, resembling the horns of a bull.



Measuring nearly 44mm in diameter, this timepiece is truly a robust and substantial watch. Its gradient brown dial, gold sub-registers, and "root beer" bezel exude an abundance of 1970s charm. Produced specifically for the Japanese domestic market, this particular variant, known as the "Speed Timer," features the distinctive "Speed Timer" label positioned just below the Seiko logo on the dial. The hands and hour markers are painted in a crisp flat white color rather than having a luminous coating. The chronograph sweep hand stands out with a vibrant fiery orange hue, and the day display can be toggled between Japanese (Kanji) and English.


The watch, including its chronograph features, operates flawlessly without any issues.


If desired, the watch can be serviced for 40,000 JPY.


Please inform us if you would like to proceed with the servicing, which typically takes approximately 1-2 months to complete.


Ships from Tokyo, Japan

SOLD - Seiko Speedtimer Bullhead 6138-0040

  • The chronograph is in very good condition: The case is strong with just some light scratches. The dial is the main attraction here as it is very clean and the hands are still intact.

    The bracelet is in very good condition and it is the correct one for this model and has a few scratches and still retains its sharp edges.

    The glass has been replaced and the movement has been lubed since it is healthy.

  • BRAND: Seiko
    MODEL: Speedtimer Bullhead
    REFERENCE: 6138-0040
    DIAL: Original orange dial
    CASE MATERIAL: Stainless Steel
    CASE DIMENSIONS: 44 x 45 mm, 20mm Lug Width, 16mm Height
    CRYSTAL: Mineral Crystal
    CASE BACK: Screw-in Stainless Steel
    MOVEMENT: Seiko Automatic Cal. 6138B
    Manufacturing date: July 1977
    Service History: Unknown, +23s/day
    Bracelet/Strap: Original and correct Seiko 5 Sports Bracelet XGA-360 on the links.

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