Seiko Cal. 6640 - 392

The 6640-392 is a sought-after Hand-Winding piece from Seiko's golden era. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-d5be3f91fd75]

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

31j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1969

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