Seiko Cal. 6691 - 642

The 6691-642 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6691 caliber with 35j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-36c221b4e296]

Also known as: Monster, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

8.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

35j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1982

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