Seiko Cal. 4487 - 738

The Seiko 4487-738 represents an important milestone in Seiko's 1981 lineup. Powered by the 4487 caliber with 32j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-ca5593900a36]

Also known as: Helmet, World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1981

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