Seiko Cal. 6631 - 635

The 6631-635 is a sought-after Solar piece from Seiko's golden era. It features a Burgundy dial protected by a Acrylic crystal and offers 200m of water resistance. [seikata-wm-894b64dc3aac]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

13.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Burgundy

Jewels

21j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1992

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