Seiko Cal. 6663 - 635

The Seiko 6663-635 represents an important milestone in Seiko's 1985 lineup. It features a Green dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-131c8fa5af4e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Green

Jewels

19j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1985

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