Seiko Cal. 6656 - 704

This Spring Drive model from 1987 features a 36mm Hardlex-Coated Steel case. Powered by the 6656 caliber with 27j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-50e441b1bbea]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Silver

Jewels

27j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1987

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