Seiko Cal. 5631 - 916

This Spring Drive model from 1998 features a 46mm PVD Black case. The Inner Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-cb047d8605fc]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

9.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

30j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1998

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