Seiko Cal. 6640 - 708

The 6640-708 is a sought-after Solar piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-e1883cf839f3]

Also known as: Tuna, Rally

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

36mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

40m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1987

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