Seiko Cal. 6691 - 390

The Seiko 6691-390 represents an important milestone in Seiko's 1993 lineup. It features a Black dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-2f2cfb369dd6]

Also known as: Turtle, Bullhead

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1993

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