Seiko Cal. 6613 - 635

The Seiko 6613-635 represents an important milestone in Seiko's 1965 lineup. It features a Navy dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-5967fe95f84e]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

180m

Dial Color

Navy

Jewels

21j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1965

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