Seiko Cal. 6640 - 524

The Seiko 6640-524 represents an important milestone in Seiko's 1979 lineup. Powered by the 6640 caliber with 27j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-b30c575665e4]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

35mm

Case Thickness

9.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1979

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