Seiko Cal. 5685 - 931

The Seiko 5685-931 represents an important milestone in Seiko's 1970 lineup. With its 18mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-5910953200f1]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1970

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