Seiko Cal. 5640 - 746

This Automatic model from 1971 features a 40mm Two-Tone case. Powered by the 5640 caliber with 28j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-b5cf3efac745]

Also known as: Flighty

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1971

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