Seiko Cal. 6644 - 858

This Hand-Winding model from 1990 features a 39mm Hardlex-Coated Steel case. Powered by the 6644 caliber with 36j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-8530f0b3fa06]

Also known as: Monster, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1990

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