Seiko Cal. 5621 - 664

This Hand-Winding model from 1986 features a 41mm Hardlex-Coated Steel case. Powered by the 5621 caliber with 33j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-f70cc4ec58af]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Navy

Jewels

33j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1986

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