Seiko Cal. 6640 - 660

The 6640-660 is a sought-after Solar piece from Seiko's golden era. It features a Green dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-1dcc327ebdb7]

Also known as: World Timer, Arnie

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1966

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