Seiko Cal. 5647 - 406

The Seiko 5647-406 represents an important milestone in Seiko's 1977 lineup. It features a Navy dial protected by a Mineral crystal and offers 130m of water resistance. [seikata-wm-6cb4a4913ce6]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Navy

Jewels

33j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1977

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