Seiko Cal. 6640 - 334

The Seiko 6640-334 represents an important milestone in Seiko's 1966 lineup. Powered by the 6640 caliber with 25j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-a590f234be2d]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

25j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1966

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