Seiko Cal. 5646 - 997

The Seiko 5646-997 represents an important milestone in Seiko's 1986 lineup. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-f513fde282b5]

Also known as: Tuna, Helmet

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

13.3mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1986

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