Seiko Cal. 6643 - 264

This Spring Drive model from 1986 features a 37mm PVD Black case. With its 18mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-9d5f8a761a69]

Also known as: Turtle, Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

30j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1986

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