Seiko Cal. 6660 - 639

The 6660-639 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-18533617fec8]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

15.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1981

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