Seiko Cal. 5640 - 866

The 5640-866 is a sought-after Kinetic piece from Seiko's golden era. With its 18mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-631ec85ca61a]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1969

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