Seiko Cal. 6640 - 813

The 6640-813 is a sought-after Spring Drive piece from Seiko's golden era. The Rotating bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-991d9fb368ca]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

46mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

23j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1988

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