Seiko Cal. 6138 - 731

The Seiko 6138-731 represents an important milestone in Seiko's 1991 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-09d69d82b6b7]

Also known as: Bullhead, UFO

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1991

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