Seiko Cal. 5635 - 641

This Spring Drive model from 1991 features a 44mm PVD Black case. It features a Black dial protected by a Mineral crystal and offers 80m of water resistance. [seikata-wm-0c9edad5f23f]

Also known as: Monster, Navigator

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1991

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