Seiko Cal. 6640 - 342

The Seiko 6640-342 represents an important milestone in Seiko's 1965 lineup. Powered by the 6640 caliber with 26j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-bf007df736ee]

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

13.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1965

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