Seiko Cal. 5631 - 327

The 5631-327 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5631 caliber with 18j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-bb5c324dd577]

Also known as: Tuna

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1978

Related Models

• Seiko 6131-893
• Seiko 6275-817
• Seiko 4583-131
• Seiko 0757-353
• Seiko 6371-560
• Seiko 5625-603
• Seiko 6115-561
• Seiko 6328-201
• Seiko 6667-994
• Seiko 6263-744
• Seiko 6146-125
• Seiko 3887-608