Seiko Cal. 6639 - 367

This Quartz model from 1970 features a 37mm PVD Black case. Powered by the 6639 caliber with 29j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-b4afd4e102c5]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

29j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1970

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