Seiko Cal. 6648 - 311

The Seiko 6648-311 represents an important milestone in Seiko's 1978 lineup. It features a Green dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-99d04c49869f]

Also known as: Helmet, Navigator

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

38mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

24j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1978

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