Seiko Cal. 6618 - 631

The 6618-631 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6618 caliber with 31j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-0914ecd6a6f1]

Also known as: Panda

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

46mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1981

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