Seiko Cal. 6690 - 840

The 6690-840 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6690 caliber with 26j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-12866bba2eea]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Black

Jewels

26j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1978

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