Seiko Cal. 5257 - 578

The Seiko 5257-578 represents an important milestone in Seiko's 1987 lineup. With its 20mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-06fb89d087cc]

Also known as: Sumo, Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1987

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