Seiko Cal. 6390 - 308

This Spring Drive model from 1989 features a 37mm PVD Black case. Powered by the 6390 caliber with 21j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-2b031e70a2bd]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1989

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