Seiko Cal. 5640 - 147

The Seiko 5640-147 represents an important milestone in Seiko's 1971 lineup. Powered by the 5640 caliber with 32j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-61ad0e6b78ee]

Also known as: Helmet, Bellmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Burgundy

Jewels

32j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1971

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