Seiko Cal. 5644 - 667

The 5644-667 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5644 caliber with 23j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-271fa0a1693a]

Also known as: UFO, World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

13.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

White

Jewels

23j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1992

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