Seiko Cal. 6640 - 338

The Seiko 6640-338 represents an important milestone in Seiko's 1967 lineup. It features a Green dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-670af66c52d5]

Also known as: Sumo, Pogue

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

39mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1967

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