Seiko Cal. 4581 - 940

The 4581-940 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4581 caliber with 36j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-56e72400ab66]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Champagne

Jewels

36j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1983

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