Seiko Cal. 6663 - 523

The 6663-523 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6663 caliber with 20j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-37fb5fb71edb]

Also known as: Monster, Silverwave

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

20j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1981

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