Seiko Cal. 6687 - 547

The Seiko 6687-547 represents an important milestone in Seiko's 1975 lineup. Powered by the 6687 caliber with 33j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-5fef71bfc767]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

39mm

Case Thickness

9.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

33j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1975

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