Seiko Cal. 5641 - 856

The 5641-856 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5641 caliber with 20j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-7436a1f4cb7a]

Also known as: Helmet, UFO

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

46mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1972

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