Seiko Cal. 5271 - 740

The Seiko 5271-740 represents an important milestone in Seiko's 1984 lineup. Powered by the 5271 caliber with 33j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-ac37b05352c7]

Also known as: Sumo, Helmet

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

40mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1984

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