Seiko Cal. 5657 - 634

The Seiko 5657-634 represents an important milestone in Seiko's 1970 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 150m of water resistance. [seikata-wm-8a9538433469]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1970

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