Seiko Cal. 6687 - 704

The Seiko 6687-704 represents an important milestone in Seiko's 1969 lineup. Powered by the 6687 caliber with 34j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-1662c96961b2]

Also known as: Monster, Bellmatic

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

34j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1969

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