Seiko Cal. 6390 - 985

The Seiko 6390-985 represents an important milestone in Seiko's 1978 lineup. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-9ed3ab48f75f]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Burgundy

Jewels

35j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1978

Related Models

• Seiko 6247-785
• Seiko 6612-850
• Seiko 6224-188
• Seiko 6639-667
• Seiko 3830-156
• Seiko 6196-567
• Seiko 4426-484
• Seiko 4596-617
• Seiko 6215-827
• Seiko 6110-359
• Seiko 6260-483
• Seiko 7026-516