Seiko Cal. 6631 - 450

The 6631-450 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-29f8e49e9751]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

34mm

Case Thickness

8.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1986

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