Seiko Cal. 6687 - 355

The Seiko 6687-355 represents an important milestone in Seiko's 1973 lineup. It features a Green dial protected by a Sapphire crystal and offers 70m of water resistance. [seikata-wm-9584d598b7cc]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

45mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Green

Jewels

21j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1973

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