Seiko Cal. 5631 - 634

This Solar model from 1968 features a 39mm Hardlex-Coated Steel case. It features a Silver dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-5b2fd84524f4]

Also known as: Sumo, Bellmatic

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Silver

Jewels

32j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1968

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