Seiko Cal. 4537 - 439

This Quartz model from 1972 features a 40mm Hardlex-Coated Steel case. Powered by the 4537 caliber with 19j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-fec74710824d]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1972

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