Seiko Cal. 4425 - 539

The Seiko 4425-539 represents an important milestone in Seiko's 1978 lineup. Powered by the 4425 caliber with 20j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-6152c0146061]

Also known as: Monster, Helmet

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

36mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1978

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