Seiko Cal. 6390 - 678

Released in 1980, the Cal. 6390 with design code 678 was part of Seiko's domestic market collection. Powered by the 6390 caliber with 25j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-ea9fb53d9e2a]

Also known as: Turtle, Helmet

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1980

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