Seiko Cal. 6640 - 297

The 6640-297 is a sought-after Solar piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-b9be1814bb53]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1976

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