Seiko Cal. 4551 - 603

The Seiko 4551-603 represents an important milestone in Seiko's 1990 lineup. Powered by the 4551 caliber with 28j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-9e05350fe4b5]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Black

Jewels

28j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1990

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