Seiko Cal. 6687 - 257

The Seiko 6687-257 represents an important milestone in Seiko's 1974 lineup. Powered by the 6687 caliber with 31j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-0e9d6945f791]

Also known as: Monster

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

43mm

Case Thickness

11.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1974

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