Seiko Cal. 6638 - 379

The 6638-379 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6638 caliber with 25j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-6e0e15ea8322]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

50m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1974

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