Seiko Cal. 5640 - 710

The Seiko 5640-710 represents an important milestone in Seiko's 1988 lineup. Powered by the 5640 caliber with 33j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-df10ddbbff3e]

Also known as: Bullhead, Emperor

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1988

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