Seiko Cal. 4487 - 520

The Seiko 4487-520 represents an important milestone in Seiko's 1979 lineup. Powered by the 4487 caliber with 22j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-52b40319f150]

Also known as: Samurai, Bellmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

11.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1979

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