Seiko Cal. 5231 - 307

The Seiko 5231-307 represents an important milestone in Seiko's 1991 lineup. With its 22mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-79b29b9b25c1]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1991

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