Seiko Cal. 5233 - 631

This Spring Drive model from 1984 features a 44mm Hardlex-Coated Steel case. Powered by the 5233 caliber with 31j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-437d82486689]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

9.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

White

Jewels

31j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1984

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