Seiko Cal. 6390 - 228

The Seiko 6390-228 represents an important milestone in Seiko's 1975 lineup. With its 22mm lug width and 12.9mm profile, it sits comfortably on most wrists. [seikata-wm-cf4beee0823f]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Cream

Jewels

18j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1975

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