Seiko Cal. 5687 - 740

The Seiko 5687-740 represents an important milestone in Seiko's 1985 lineup. It features a Black dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-a3b5251384ab]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

190m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1985

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