Seiko Cal. 4566 - 638

The 4566-638 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4566 caliber with 25j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-5afae1bc9fb7]

Also known as: Monster, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

25j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1967

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