Seiko Cal. 4540 - 597

This Spring Drive model from 1967 features a 41mm PVD Black case. Powered by the 4540 caliber with 35j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-2c2ab25ea11d]

Also known as: Monster, Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

White

Jewels

35j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1967

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