Seiko Cal. 6687 - 734

The 6687-734 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6687 caliber with 27j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-37c5fb30891e]

Also known as: Tuna, Silverwave

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1991

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