Seiko Cal. 6637 - 583

The 6637-583 is a sought-after Quartz piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-b7521f540df7]

Also known as: Bullhead, Navigator

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1990

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