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Seiko

Seiko Chronograph 6138-3000 "Jumbo"

Seiko Chronograph 6138-3000 "Jumbo"

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Brand

seiko

Diameter

42mm

Model

Chronograph

Year

1970 - 1979

Reference

Jumbo

Water resistant?

No

Movimento

Automatic

Case material

Steel

Specifications

Caliber 6138 Automatic

Manufactured in 1972

Approximate dimensions:

- 42mm (case without crown)

- 47.5mm (lug to lug)

- 19mm (lug width)

- 14mm (thickness)

Description

Steel bracelet for wrists up to approximately 19 cm

Watch only, without box or original documentation

The person in the photo has a wrist measuring approximately 17 cm for reference

Learn more

The Seiko 6138-3000 was nicknamed “Jumbo” because of its robust size for the time—a 42mm diameter stainless steel case that made it quite imposing on the wrist.

Equipped with the 6138 caliber, this watch represented a significant advancement in watchmaking, combining chronograph functionality with an automatic winding mechanism and a day-date complication.

Aesthetically, the Seiko 6138-3000 features a classic yet striking look, with a deep black dial, contrasting white sub-dials, and white hands that offer excellent legibility. The two sub-dials are positioned vertically: one for the 30-minute counter and the other for accumulated hours, allowing for longer time measurements.

The absence of an outer bezel enhances the model's clean and solid appearance, appealing to both vintage enthusiasts and modern collectors.

In addition to its visual and technical appeal, the Seiko 6138-3000 holds historical significance as part of the automatic chronograph line launched by Seiko shortly after the introduction of the 6139 caliber—one of the world's first automatic chronographs.

The movement's durability, reliable engineering, and timeless style make the 6138-3000 an icon among vintage Japanese watches, and it is highly prized today by horology enthusiasts.

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Quality

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