Seiko Cal. 4531 - 187

The 4531-187 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4531 caliber with 22j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-68c5515ead23]

Also known as: Tuna, UFO

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

22j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1982

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