Seiko Cal. 6688 - 640

The Seiko 6688-640 represents an important milestone in Seiko's 1999 lineup. It features a Green dial protected by a Mineral crystal and offers 120m of water resistance. [seikata-wm-3c3bfa0316a3]

Also known as: Navigator

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Green

Jewels

27j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1999

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