Seiko Cal. 4531 - 660

The 4531-660 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4531 caliber with 20j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-4c41cf4f14d4]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Burgundy

Jewels

20j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1983

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