Seiko Cal. 5644 - 729

The 5644-729 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5644 caliber with 25j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-8bc5c2c622bd]

Also known as: Samurai, Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

9.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1968

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