Seiko Cal. 5657 - 566

The 5657-566 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5657 caliber with 25j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-57d1c7ca44ba]

Also known as: Monster, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1975

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