Seiko Cal. 5637 - 711

The 5637-711 is a sought-after Automatic piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 200m of water resistance. [seikata-wm-e0e585903976]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

45mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1972

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