Seiko Cal. 4487 - 687

The Seiko 4487-687 represents an important milestone in Seiko's 1979 lineup. Powered by the 4487 caliber with 24j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-daab39da0189]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1979

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