Seiko Cal. 5640 - 816

The Seiko 5640-816 represents an important milestone in Seiko's 1982 lineup. It features a Navy dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-d8ede8cdfe04]

Also known as: UFO, Silverwave

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

43mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1982

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