Seiko Cal. 5640 - 828

The Seiko 5640-828 represents an important milestone in Seiko's 1987 lineup. Powered by the 5640 caliber with 33j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-077090a81cc0]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

42mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1987

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