Seiko Cal. 3864 - 640

This Spring Drive model from 1980 features a 43mm Stainless Steel case. It features a Navy dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-b10f1ef1d3e0]

Also known as: Sumo, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1980

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