Seiko Cal. 5654 - 640

The Seiko 5654-640 represents an important milestone in Seiko's 1971 lineup. Powered by the 5654 caliber with 35j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-d3aec78d6da4]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

35j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1971

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