Seiko Cal. 6640 - 790

The 6640-790 is a sought-after Automatic piece from Seiko's golden era. It features a Black dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-48cc6fbb29c6]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

44mm

Case Thickness

13.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

120m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1969

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