Seiko Cal. 5231 - 665

The Seiko 5231-665 represents an important milestone in Seiko's 1990 lineup. Powered by the 5231 caliber with 30j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-ebed4c223144]

Also known as: UFO, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

13.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1990

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