Seiko Cal. 6637 - 663

This Hand-Winding model from 1987 features a 42mm Hardlex-Coated Steel case. It features a White dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-f03161497a7a]

Also known as: Rally, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1987

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