Seiko Cal. 6684 - 727

This Spring Drive model from 1971 features a 36mm Two-Tone case. It features a Green dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-987cf4de0016]

Also known as: Sumo, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Green

Jewels

20j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1971

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