Seiko Cal. 6646 - 321

This Spring Drive model from 1967 features a 36mm Hardlex-Coated Steel case. It features a Navy dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-18428ccdea1a]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

13.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Navy

Jewels

24j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1967

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