Seiko Cal. 5640 - 404

This Spring Drive model from 1966 features a 45mm Hardlex-Coated Steel case. It features a Burgundy dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-5d8d19ab7aa6]

Also known as: Navigator, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Burgundy

Jewels

17j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1966

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