Seiko Cal. 5231 - 266

The 5231-266 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5231 caliber with 18j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-86842b05e4a3]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Burgundy

Jewels

18j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1972

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