Seiko Cal. 4487 - 379

The 4487-379 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4487 caliber with 29j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-8cdfce6fbe39]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

9.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1976

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