Seiko Cal. 5690 - 321

The Seiko 5690-321 represents an important milestone in Seiko's 1970 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-c3ac065cd28b]

Specifications

Movement

Solar

Case Material

Titanium

Case Width

43mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1970

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