Seiko Cal. 6690 - 540

Released in 1986, the Cal. 6690 with design code 540 was part of Seiko's domestic market collection. Powered by the 6690 caliber with 34j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-6b5eedc856ee]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

34j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1986

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