Seiko Cal. 5631 - 395

The Seiko 5631-395 represents an important milestone in Seiko's 1968 lineup. It features a Navy dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-de47ae6d191d]

Also known as: UFO, Golden Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

12.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1968

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