Seiko Cal. 5623 - 638

This Spring Drive model from 1997 features a 36mm Two-Tone case. Powered by the 5623 caliber with 31j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-dc1cd884561a]

Also known as: Monster, Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1997

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