Seiko Cal. 6640 - 669

The 6640-669 is a sought-after Kinetic piece from Seiko's golden era. With its 18mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-fd3ac70ba308]

Also known as: Turtle, Crown

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1988

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