Seiko Cal. 7131 - 577

Seiko 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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