Seiko Cal. 6640 - 645

The 6640-645 is a sought-after Solar piece from Seiko's golden era. It features a Burgundy dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-883d17bb6a03]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

14.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Burgundy

Jewels

30j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1970

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