Seiko Cal. 5644 - 632

The 5644-632 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5644 caliber with 31j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-6a26cf96fa4d]

Also known as: Monster, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

14.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Burgundy

Jewels

31j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1965

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