Seiko Cal. 5644 - 735

The Seiko 5644-735 represents an important milestone in Seiko's 1966 lineup. It features a Black dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-b4c40fa1fe71]

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Black

Jewels

17j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1966

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