Seiko Cal. 5631 - 406

The Seiko 5631-406 represents an important milestone in Seiko's 1970 lineup. It features a Green dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-d0b245eca912]

Also known as: Tuna, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

39mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Green

Jewels

17j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1970

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