Seiko Cal. 6640 - 364

The Seiko 6640-364 represents an important milestone in Seiko's 1969 lineup. It features a Cream dial protected by a Acrylic crystal and offers 50m of water resistance. [seikata-wm-6067eb4663cd]

Also known as: Turtle, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

13.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1969

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