Seiko Cal. 6643 - 957

The Seiko 6643-957 represents an important milestone in Seiko's 1970 lineup. It features a Burgundy dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-5f0a3c679a68]

Also known as: Turtle, Baby Tuna

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

11.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Burgundy

Jewels

18j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1970

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