Seiko Cal. 6640 - 284

The 6640-284 is a sought-after Automatic piece from Seiko's golden era. With its 19mm lug width and 11.4mm profile, it sits comfortably on most wrists. [seikata-wm-cd590a32d0ce]

Also known as: Helmet, Crown

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

35mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

Champagne

Jewels

32j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1989

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