Seiko Cal. 6644 - 732

This Spring Drive model from 1991 features a 42mm Hardlex-Coated Steel case. It features a Black dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-c73c283b17b9]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

200m

Dial Color

Black

Jewels

27j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1991

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