Seiko Cal. 6640 - 349

The 6640-349 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 17j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-287e9a702ce3]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1973

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