Seiko Cal. 7131 - 828

The Seiko 7131-828 represents an important milestone in Seiko's 1977 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-0f44690c78c5]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1977

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