Seiko Cal. 4540 - 580

This Spring Drive model from 1966 features a 45mm Two-Tone case. Powered by the 4540 caliber with 26j jewels beating at 28,800 bph, it delivers a 57 hours power reserve. [seikata-wm-6430a73a71fc]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Navy

Jewels

26j

Frequency

28,800 bph

Power Reserve

57 hours

Year

1966

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