Seiko Cal. 4471 - 636

This Quartz model from 1972 features a 34mm PVD Black case. Powered by the 4471 caliber with 23j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-8aa5e947caee]

Also known as: Sumo, World Timer

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

34mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1972

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