Seiko Cal. 6687 - 818

Released in 1971, the Cal. 6687 with design code 818 was part of Seiko's domestic market collection. Powered by the 6687 caliber with 27j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-54bb1605bcd1]

Also known as: Turtle, World Timer

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

13.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

130m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1971

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