Seiko Cal. 7131 - 523

The Seiko 7131-523 represents an important milestone in Seiko's 1977 lineup. Powered by the 7131 caliber with 32j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-b380066bbec5]

Also known as: Bullhead, Flighty

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

42mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1977

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