Seiko Cal. 7131 - 577

The 7131-577 is a sought-after Automatic piece from Seiko's golden era. Powered by the 7131 caliber with 33j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-3829a65af0df]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

42mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1984

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