Seiko Cal. 5640 - 280

The Seiko 5640-280 represents an important milestone in Seiko's 1999 lineup. Powered by the 5640 caliber with 32j jewels beating at 21,600 bph, it delivers a 56 hours power reserve. [seikata-wm-acfa43c5aaf0]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

32j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1999

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