Seiko Cal. 6640 - 352

The Seiko 6640-352 represents an important milestone in Seiko's 1966 lineup. It features a Champagne dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-eff5be70b5d6]

Also known as: Monster, Rally

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

9.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

34j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1966

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