Seiko Cal. 6640 - 166

This Solar model from 1972 features a 40mm Stainless Steel case. Powered by the 6640 caliber with 22j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-43f7dc95e4a1]

Also known as: Monster

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Navy

Jewels

22j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1972

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