Seiko Cal. 6690 - 538

The 6690-538 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6690 caliber with 18j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-8504be401f66]

Also known as: Monster, Flighty

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

White

Jewels

18j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1980

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