Seiko Cal. 5631 - 561

This Spring Drive model from 1971 features a 40mm Titanium case. It features a Champagne dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-4f286cb58b0b]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Champagne

Jewels

19j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1971

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