Seiko Cal. 6640 - 619

The 6640-619 is a sought-after Solar piece from Seiko's golden era. Powered by the 6640 caliber with 32j jewels beating at 28,800 bph, it delivers a 44 hours power reserve. [seikata-wm-0d2e28ee74e0]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

44 hours

Year

1968

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