Seiko Cal. 5231 - 636

This Hand-Winding model from 1971 features a 44mm PVD Black case. Powered by the 5231 caliber with 32j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-dab6978a49ad]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

80m

Dial Color

Silver

Jewels

32j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1971

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