Seiko Cal. 6631 - 570

The 6631-570 is a sought-after Quartz piece from Seiko's golden era. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-df97fe7e0a48]

Also known as: Turtle, Arnie

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

39mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1974

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