Seiko Cal. 6613 - 640

The Seiko 6613-640 represents an important milestone in Seiko's 1969 lineup. Powered by the 6613 caliber with 33j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-6ea597a63830]

Also known as: Turtle, Monster

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

8.5mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

White

Jewels

33j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1969

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