Seiko Cal. 6690 - 307

The Seiko 6690-307 represents an important milestone in Seiko's 1979 lineup. It features a Green dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-c5561e96c490]

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

9.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Green

Jewels

33j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1979

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