Seiko Cal. 6390 - 739

The 6390-739 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6390 caliber with 25j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-eeacb108e5f9]

Also known as: Sumo, Helmet

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1978

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