Seiko Cal. 6131 - 161

The Seiko 6131-161 represents an important milestone in Seiko's 1971 lineup. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-afd3f85196af]

Also known as: Monster, Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

11.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1971

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