Seiko Cal. 6390 - 856

The Seiko 6390-856 represents an important milestone in Seiko's 1976 lineup. Powered by the 6390 caliber with 30j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-66637223d7fe]

Also known as: Bullhead, Silverwave

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

30j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1976

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