Seiko Cal. 5223 - 231

The 5223-231 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5223 caliber with 28j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-99da7bb96f9b]

Also known as: Sumo, UFO

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

28j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1974

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