Seiko Cal. 3817 - 528

This Spring Drive model from 1974 features a 41mm PVD Black case. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ee52ff63a58f]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1974

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