Seiko Cal. 5660 - 307

The Seiko 5660-307 represents an important milestone in Seiko's 1976 lineup. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-fbdd7cc60d7a]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

37mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1976

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