Seiko Cal. 5639 - 257

The Seiko 5639-257 represents an important milestone in Seiko's 1990 lineup. It features a Navy dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-89ff54873ccf]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

36mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Navy

Jewels

35j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1990

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